Bump com.google.errorprone:error_prone_core from 2.20.0 to 2.21.0 (#52)

Bumps [com.google.errorprone:error_prone_core](https://github.com/google/error-prone) from 2.20.0 to 2.21.0.
- [Release notes](https://github.com/google/error-prone/releases)
- [Commits](https://github.com/google/error-prone/compare/v2.20.0...v2.21.0)

---
updated-dependencies:
- dependency-name: com.google.errorprone:error_prone_core
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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