6.2.0

Changed:
- Force movebis artifactId to lower case in publish workflow
- Set target-/compile-/build-tools version from 29 to 30 (Android 11)
- Upgrade dependencies (gradle 5->6.8, Android Build Tools to 4.1.1, and many more)
- Upgrade Cyface utils to 2.0.1 (which uses Android 11, too)
- Renamed master branch to main
- Declare foregroundServiceType in JAVA code (required by Android 11)