* Make use of `TYPESAFE_PROJECT_ACCESSORS` and `VERSION_CATALOGS` Gradle feature previews to clean up build scripts
* Bump setup-java action to v2, specify AdoptOpenJDK distribution
This has been tested on the following:
- AdoptOpenJDK Java 1.8.0_282
- GraalVM CE 21.0.0 OpenJDK 11.0.10
- AdoptOpenJDK Java 15.0.2
- AdoptOpenJDK Java 16 (also tested with BungeeCord b1556)
- Amazon Corretto OpenJDK 16.0.0.36.1
... with Waterfall b406 on Linux 5.10.28.