fix(deps): update dependency checkstyle to v10.21.1 (spotbugs#3240)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

gradle/checkstyle.gradle

@@ -2,7 +2,7 @@
 apply plugin: 'checkstyle'
 
 checkstyle {
-  toolVersion '10.21.0'
+  toolVersion '10.21.1'
   ignoreFailures false
   configFile file("$rootDir/spotbugs/etc/checkstyle.xml") // TODO : This config file is lame and should be moved out...
 }