Tooling: upgrade to checkstyle v10.18.2

Author: cagix

build.gradle

@@ -43,7 +43,7 @@ checkstyle {
     // Default version vs. current version? The default version is quite old (9.3 from
     // Jan 30, 2022), so let's go with the current version (10.17).
     // However, this needs to be updated manually as Dependabot won't deal with this!
-    toolVersion = '10.18.1'
+    toolVersion = '10.18.2'
     ignoreFailures = false
     maxWarnings = 0
 }