Bump com.google.errorprone:error_prone_annotations

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

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

Signed-off-by: dependabot[bot] <[email protected]>

pgp-keys-map-test1/pom.xml

@@ -120,7 +120,7 @@
         <dependency>
             <groupId>com.google.errorprone</groupId>
             <artifactId>error_prone_annotations</artifactId>
-            <version>[2.20.0]</version>
+            <version>[2.21.0]</version>
         </dependency>
         <dependency>
             <groupId>com.google.googlejavaformat</groupId>