chore(deps): Update dependency com.puppycrawl.tools:checkstyle to v10.21.1

Author: renovate[bot]

gradle/libs.versions.toml

@@ -2,7 +2,7 @@
 version = "1.0"
 
 [versions]
-checkstyle = "10.20.2"
+checkstyle = "10.21.1"
 ideaExt = "1.1.9"
 indra = "3.1.3"
 junit = "5.11.3"