Update dependency checkstyle to v13

renovate[bot] · web-flow · commit 85550407dcf1 · 2026-02-28T20:41:08.000Z
diff --git a/build.gradle b/build.gradle
@@ -15,7 +15,7 @@ java {
 }
 
 checkstyle {
-    toolVersion = "12.3.1"
+    toolVersion = "13.3.0"
     maxWarnings = 0
 }
 
