Swap to new Google Maven Central mirror URL

As seen at https://maven-central.storage.googleapis.com/index.html . The old
URL still has content, but apparently is no longer being updated. For example,
jetty-alpn-agent-2.0.10.pom is not present.
diff --git a/build.gradle b/build.gradle
index d8f56ec..49350d4 100644
--- a/build.gradle
+++ b/build.gradle
@@ -23,7 +23,7 @@
 
     repositories {
         maven { // The google mirror is less flaky than mavenCentral()
-            url "https://maven-central.storage-download.googleapis.com/repos/central/data/" }
+            url "https://maven-central.storage-download.googleapis.com/maven2/" }
         mavenCentral()
         mavenLocal()
     }
diff --git a/examples/build.gradle b/examples/build.gradle
index 2a06451..c4ee917 100644
--- a/examples/build.gradle
+++ b/examples/build.gradle
@@ -9,7 +9,7 @@
 
 repositories {
     maven { // The google mirror is less flaky than mavenCentral()
-        url "https://maven-central.storage-download.googleapis.com/repos/central/data/" }
+        url "https://maven-central.storage-download.googleapis.com/maven2/" }
     mavenCentral()
     mavenLocal()
 }
diff --git a/examples/example-alts/build.gradle b/examples/example-alts/build.gradle
index be96ba3..e468e06 100644
--- a/examples/example-alts/build.gradle
+++ b/examples/example-alts/build.gradle
@@ -9,7 +9,7 @@
 
 repositories {
     maven { // The google mirror is less flaky than mavenCentral()
-        url "https://maven-central.storage-download.googleapis.com/repos/central/data/"
+        url "https://maven-central.storage-download.googleapis.com/maven2/"
     }
     mavenCentral()
     mavenLocal()
diff --git a/examples/example-alts/settings.gradle b/examples/example-alts/settings.gradle
index 59ef05d..273558d 100644
--- a/examples/example-alts/settings.gradle
+++ b/examples/example-alts/settings.gradle
@@ -1,7 +1,7 @@
 pluginManagement {
     repositories {
         maven { // The google mirror is less flaky than mavenCentral()
-            url "https://maven-central.storage-download.googleapis.com/repos/central/data/"
+            url "https://maven-central.storage-download.googleapis.com/maven2/"
         }
         gradlePluginPortal()
     }
diff --git a/examples/example-gauth/build.gradle b/examples/example-gauth/build.gradle
index 1680c46..9505afb 100644
--- a/examples/example-gauth/build.gradle
+++ b/examples/example-gauth/build.gradle
@@ -9,7 +9,7 @@
 
 repositories {
     maven { // The google mirror is less flaky than mavenCentral()
-        url "https://maven-central.storage-download.googleapis.com/repos/central/data/"
+        url "https://maven-central.storage-download.googleapis.com/maven2/"
     }
     mavenCentral()
     mavenLocal()
diff --git a/examples/example-gauth/settings.gradle b/examples/example-gauth/settings.gradle
index 59ef05d..273558d 100644
--- a/examples/example-gauth/settings.gradle
+++ b/examples/example-gauth/settings.gradle
@@ -1,7 +1,7 @@
 pluginManagement {
     repositories {
         maven { // The google mirror is less flaky than mavenCentral()
-            url "https://maven-central.storage-download.googleapis.com/repos/central/data/"
+            url "https://maven-central.storage-download.googleapis.com/maven2/"
         }
         gradlePluginPortal()
     }
diff --git a/examples/example-hostname/build.gradle b/examples/example-hostname/build.gradle
index 4591067..7f3c1f5 100644
--- a/examples/example-hostname/build.gradle
+++ b/examples/example-hostname/build.gradle
@@ -8,7 +8,7 @@
 
 repositories {
     maven { // The google mirror is less flaky than mavenCentral()
-        url "https://maven-central.storage-download.googleapis.com/repos/central/data/" }
+        url "https://maven-central.storage-download.googleapis.com/maven2/" }
     mavenCentral()
     mavenLocal()
 }
diff --git a/examples/example-jwt-auth/build.gradle b/examples/example-jwt-auth/build.gradle
index 975c7dd..351b857 100644
--- a/examples/example-jwt-auth/build.gradle
+++ b/examples/example-jwt-auth/build.gradle
@@ -9,7 +9,7 @@
 
 repositories {
     maven { // The google mirror is less flaky than mavenCentral()
-        url "https://maven-central.storage-download.googleapis.com/repos/central/data/"
+        url "https://maven-central.storage-download.googleapis.com/maven2/"
     }
     mavenLocal()
 }
diff --git a/examples/example-jwt-auth/settings.gradle b/examples/example-jwt-auth/settings.gradle
index 59ef05d..273558d 100644
--- a/examples/example-jwt-auth/settings.gradle
+++ b/examples/example-jwt-auth/settings.gradle
@@ -1,7 +1,7 @@
 pluginManagement {
     repositories {
         maven { // The google mirror is less flaky than mavenCentral()
-            url "https://maven-central.storage-download.googleapis.com/repos/central/data/"
+            url "https://maven-central.storage-download.googleapis.com/maven2/"
         }
         gradlePluginPortal()
     }
diff --git a/examples/example-tls/build.gradle b/examples/example-tls/build.gradle
index 571ea53..fe21a94 100644
--- a/examples/example-tls/build.gradle
+++ b/examples/example-tls/build.gradle
@@ -9,7 +9,7 @@
 
 repositories {
     maven { // The google mirror is less flaky than mavenCentral()
-        url "https://maven-central.storage-download.googleapis.com/repos/central/data/"
+        url "https://maven-central.storage-download.googleapis.com/maven2/"
     }
     mavenCentral()
     mavenLocal()
diff --git a/examples/example-tls/settings.gradle b/examples/example-tls/settings.gradle
index 59ef05d..273558d 100644
--- a/examples/example-tls/settings.gradle
+++ b/examples/example-tls/settings.gradle
@@ -1,7 +1,7 @@
 pluginManagement {
     repositories {
         maven { // The google mirror is less flaky than mavenCentral()
-            url "https://maven-central.storage-download.googleapis.com/repos/central/data/"
+            url "https://maven-central.storage-download.googleapis.com/maven2/"
         }
         gradlePluginPortal()
     }
diff --git a/examples/example-xds/build.gradle b/examples/example-xds/build.gradle
index 28e3463..40fa0f4 100644
--- a/examples/example-xds/build.gradle
+++ b/examples/example-xds/build.gradle
@@ -5,7 +5,7 @@
 
 repositories {
     maven { // The google mirror is less flaky than mavenCentral()
-        url "https://maven-central.storage-download.googleapis.com/repos/central/data/" }
+        url "https://maven-central.storage-download.googleapis.com/maven2/" }
     mavenCentral()
     mavenLocal()
 }
diff --git a/examples/settings.gradle b/examples/settings.gradle
index b5f6302..0473750 100644
--- a/examples/settings.gradle
+++ b/examples/settings.gradle
@@ -1,7 +1,7 @@
 pluginManagement {
     repositories {
         maven { // The google mirror is less flaky than mavenCentral()
-            url "https://maven-central.storage-download.googleapis.com/repos/central/data/"
+            url "https://maven-central.storage-download.googleapis.com/maven2/"
         }
         gradlePluginPortal()
     }
diff --git a/gae-interop-testing/gae-jdk8/build.gradle b/gae-interop-testing/gae-jdk8/build.gradle
index 58d6ab7..7b21450 100644
--- a/gae-interop-testing/gae-jdk8/build.gradle
+++ b/gae-interop-testing/gae-jdk8/build.gradle
@@ -17,7 +17,7 @@
     repositories {
         jcenter()    // Bintray's repository - a fast Maven Central mirror & more
         maven { // The google mirror is less flaky than mavenCentral()
-            url "https://maven-central.storage-download.googleapis.com/repos/central/data/" }
+            url "https://maven-central.storage-download.googleapis.com/maven2/" }
     }
     dependencies {
         classpath 'com.google.cloud.tools:appengine-gradle-plugin:1.3.5'
@@ -36,7 +36,7 @@
     // repositories for Jar's you access in your code
     mavenLocal()
     maven { // The google mirror is less flaky than mavenCentral()
-        url "https://maven-central.storage-download.googleapis.com/repos/central/data/" }
+        url "https://maven-central.storage-download.googleapis.com/maven2/" }
     jcenter()
 }