update the Checkstyle tool to v13.1.0

stephengold · stephengold · commit 2be5f836662f · 2026-02-01T00:35:39.000-08:00
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
@@ -2,7 +2,7 @@
 
 [versions]
 
-checkstyle = "13.0.0"
+checkstyle = "13.1.0"
 jme = "3.9.0-stable"
 
 [libraries]
