Updates Android build configuration to use newer versions:
- Upgrade Java/JVM target from 17 to 21
- Update Android Gradle Plugin from 8.1.2 to 8.8.0
These changes modernize the Android build system to use the latest LTS
version of Java and the most recent stable Android Gradle Plugin.
This enables access to newer language features and build optimizations
while maintaining compatibility with modern Android development tools.
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