Upgrade to Kotlin 1.4.30

Additionally move to using to mavenCentral where possible.

Test: ./gradlew
Change-Id: Ib1ea3d2825118bd24827a4778022644e6e7df7d8
diff --git a/build.gradle.kts b/build.gradle.kts
index bf05a15..db8fc23 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -20,7 +20,8 @@
 
 repositories {
     google()
-    jcenter()
+    mavenCentral()
+    jcenter() // needed for trove4j
     val lintRepo = project.findProperty("lintRepo") as String?
     if (lintRepo != null) {
         logger.warn("Building using custom $lintRepo maven repository")
@@ -31,7 +32,7 @@
 }
 
 plugins {
-    kotlin("jvm") version "1.4.20"
+    kotlin("jvm") version "1.4.30"
     id("application")
     id("java")
     id("maven-publish")
@@ -69,7 +70,7 @@
 } else {
     "27.2.0-alpha11"
 }
-val kotlinVersion: String = "1.4.20"
+val kotlinVersion: String = "1.4.30"
 
 dependencies {
     implementation("com.android.tools.external.org-jetbrains:uast:$studioVersion")
diff --git a/buildSrc/build.gradle.kts b/buildSrc/build.gradle.kts
index 2ade799..23957b2 100644
--- a/buildSrc/build.gradle.kts
+++ b/buildSrc/build.gradle.kts
@@ -15,11 +15,11 @@
  */
 
 plugins {
-    kotlin("jvm") version "1.4.20"
+    kotlin("jvm") version "1.4.30"
 }
 
 repositories {
-    jcenter()
+    mavenCentral()
 }
 
 dependencies {