Upgrade to androidx.test:core:1.5.0-alpha02

This version has a fix for API 33 explicit activity
requirement

Bug: 240365524
Test: ./gradlew assembleDebug
Change-Id: I2dfcd1402f67b95d06f6a4fbc983f4d020d22cd1
diff --git a/testutils/testutils-gradle-plugin/build.gradle b/testutils/testutils-gradle-plugin/build.gradle
index e8d7ab2..b1885a3 100644
--- a/testutils/testutils-gradle-plugin/build.gradle
+++ b/testutils/testutils-gradle-plugin/build.gradle
@@ -23,9 +23,7 @@
 
 dependencies {
     implementation(libs.kotlinStdlib)
-    implementation(libs.testExtJunit)
-    implementation(libs.testCore)
-    implementation(libs.testRules)
+    implementation(libs.junit)
 }
 
 androidx {