Update dependency checkstyle to v12

renovate[bot] · web-flow · commit 71bcfb80abdc · 2025-10-11T21:47:35.000Z
diff --git a/build.gradle b/build.gradle
@@ -15,7 +15,7 @@ java {
 }
 
 checkstyle {
-    toolVersion = "10.26.1"
+    toolVersion = "12.0.1"
     maxWarnings = 0
 }
 
