Merge pull request #789 from uhafner/dependabot/maven/error-prone.ver…

…sion-2.21.1

Bump error-prone.version from 2.20.0 to 2.21.1

pom.xml

@@ -89,7 +89,7 @@
     <jacoco-maven-plugin.version>0.8.10</jacoco-maven-plugin.version>
     <maven-pitest-plugin.version>1.14.4</maven-pitest-plugin.version>
     <pitest-junit5-plugin.version>1.2.0</pitest-junit5-plugin.version>
-    <error-prone.version>2.20.0</error-prone.version>
+    <error-prone.version>2.21.1</error-prone.version>
     <nullaway.version>0.10.14</nullaway.version>
     <revapi-maven-plugin.version>0.15.0</revapi-maven-plugin.version>
     <revapi-java.version>0.28.1</revapi-java.version>