deps: update dependency com.google.errorprone:error_prone_annotations to v2.6.0 (googleapis#417)

Author: renovate-bot

java-resourcemanager/google-cloud-resourcemanager/pom.xml

@@ -77,7 +77,7 @@
       <dependency>
         <groupId>com.google.errorprone</groupId>
         <artifactId>error_prone_annotations</artifactId>
-        <version>2.5.1</version>
+        <version>2.6.0</version>
       </dependency>
     </dependencies>
   </dependencyManagement>