Bump com.google.errorprone:error_prone_core from 2.21.0 to 2.21.1 (#55)

Bumps [com.google.errorprone:error_prone_core](https://github.com/google/error-prone) from 2.21.0 to 2.21.1.
- [Release notes](https://github.com/google/error-prone/releases)
- [Commits](google/error-prone@v2.21.0...v2.21.1)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

log4j-transform-parent/pom.xml

@@ -50,7 +50,7 @@
     <spotbugs.version>4.7.3</spotbugs.version>
     <!-- plugin versions -->
     <bundle-plugin.version>5.1.8</bundle-plugin.version>
-    <error-prone.version>2.21.0</error-prone.version>
+    <error-prone.version>2.21.1</error-prone.version>
     <jacoco-maven-plugin.version>0.8.10</jacoco-maven-plugin.version>
     <findsecbugs-plugin.version>1.12.0</findsecbugs-plugin.version>
     <maven-invoker-plugin.version>3.5.1</maven-invoker-plugin.version>