Bump dependencies

Bump
[com.puppycrawl.tools:checkstyle](https://github.com/checkstyle/checkstyle)
from 10.4 to 10.12.2.

build.gradle

@@ -30,7 +30,7 @@ allprojects {
         nanojsonVersion = "1d9e1aea9049fc9f85e68b43ba39fe7be1c1f751"
         spotbugsVersion = "4.8.6"
         junitVersion = "5.10.3"
-        checkstyleVersion = "10.4"
+        checkstyleVersion = "10.12.2"
     }
 }