* Build system & pipeline changes
- Updated Gradle to 7.1.1 & removed deprecations
- Added Google Maven repository & updated Dagger to 2.38
- Set new options.release parameter for submodules, allows producing Java 8 -compatible bytecode with Java 16 (also ensures that no APIs from a newer version are used)
- Updated workflows to use newer versions of checkout & setup-java
- Added a Gradle dependency cache task to workflows, allows for faster builds
* Cleanup cache after build