Bump annotations from 17.0.0 to 20.1.0 in /buildinggame
Bump annotations from 17.0.0 to 20.1.0 in /buildinggame

Bumps [annotations](https://github.com/JetBrains/java-annotations) from 17.0.0 to 20.1.0.
- [Release notes](https://github.com/JetBrains/java-annotations/releases)
- [Changelog](https://github.com/JetBrains/java-annotations/blob/master/CHANGELOG.md)
- [Commits](https://github.com/JetBrains/java-annotations/compare/17.0.0...20.1.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
stefvanschie/buildinggame