Bump error_prone_core from 2.17.0 to 2.18.0

Dependabot couldn't find the original pull request head commit, 6b0355a.

Author: dependabot[bot]

acceptance-tests/acceptance-tests-error-prone/pom.xml

@@ -47,7 +47,7 @@
       --add-opens=jdk.compiler/com.sun.tools.javac.comp=ALL-UNNAMED
     </argLine>
 
-    <error-prone.version>2.17.0</error-prone.version>
+    <error-prone.version>2.18.0</error-prone.version>
   </properties>
 
   <dependencies>