chore(deps): update dependency com.google.errorprone:error_prone_core to v2.28.0 (#127)

Author: renovate-bot

pom.xml

@@ -38,7 +38,7 @@
     <exec-maven.version>3.3.0</exec-maven.version>
     <build-helper-maven-plugin.version>3.6.0</build-helper-maven-plugin.version>
     <auto-value.version>1.11.0</auto-value.version>
-    <error-prone.version>2.27.1</error-prone.version>
+    <error-prone.version>2.28.0</error-prone.version>
     <maven-checkstyle-plugin.version>3.4.0</maven-checkstyle-plugin.version>
     <maven-assembly-plugin.version>3.7.1</maven-assembly-plugin.version>
   </properties>