Adjustments for Gradle 8 build environment.
Gradle 8 requires JDK version 11. Update build class path to pick up new Gradle version. Build tools version 30.0.2 -> 30.0.3.
Gradle 8 requires JDK version 11. Update build class path to pick up new Gradle version. Build tools version 30.0.2 -> 30.0.3.