update the Checkstyle tool to v12.1.1

stephengold · stephengold · commit 4458ff8d3117 · 2025-10-26T17:53:00.000-07:00
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
@@ -2,7 +2,7 @@
 
 [versions]
 
-checkstyle = "12.1.0"
+checkstyle = "12.1.1"
 imageio = "3.12.0"
 
 ## production versions:
