Update dependency checkstyle to v12

renovate[bot] · web-flow · commit 699ac0625e3d · 2025-10-19T17:57:38.000Z
diff --git a/build.gradle b/build.gradle
@@ -15,7 +15,7 @@ java {
 }
 
 checkstyle {
-    toolVersion = "10.26.1"
+    toolVersion = "12.1.0"
     maxWarnings = 0
 }
 
