Upgrade Gradle to 9.3.1 and AGP to 9.0.0

[Copilot]

Three Dependabot PRs (#2532, #2537, #2538) failed individually due to circular dependency: AGP 9.0.0 requires Gradle 9.x. Combined all three.

Changes

Dependencies

• Gradle: 8.14.2 → 9.3.1 (root and android wrappers)
• Android Gradle Plugin: 8.13.2 → 9.0.0

CI: Gradle 9.x JVM requirement
Gradle 9.x requires JVM 17+ to run. Updated build-java-8 workflow to install both JDKs:

• Java 8: toolchain for compiling to Java 8 bytecode
• Java 17: primary JDK for running Gradle daemon

Build: Java 8 compiler OOM
compileJava task was hitting 512MB default heap limit. Configured fork options:

tasks.withType(JavaCompile).configureEach {
    options.fork = true
    options.forkOptions.memoryMaximumSize = '2g'
}

Original prompt

investigate and combine changes in #2532, #2537, #2538. Their PR checks are failing because they depend on each other.

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