Groovy does not automatically use the compileJava settings so we need
to define compileGroovy.
Also defining as Java 1.8 so when a project consuming this plugin
it can run it with getting a "class file version" error.
This will fix errors such as
* What went wrong:
A problem occurred evaluating project ':app'.
> com/onesignal/androidsdk/GradleProjectPlugin has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
Tests
Manual
Ran ./gradle build on an Android project with a local build of this plugin with Java 8 to reproduce the issue. Then rebuilt with this new setting to ensure this resolved the issue.
This will fix errors such as
Tests
Manual
Ran
./gradle buildon an Android project with a local build of this plugin with Java 8 to reproduce the issue. Then rebuilt with this new setting to ensure this resolved the issue.This change is