Update dependency com.puppycrawl.tools:checkstyle to v12

Author: renovate[bot]

pom.xml

@@ -89,7 +89,7 @@ SOFTWARE.
     <slf4j.version>2.0.9</slf4j.version>
     <jtcop.version>0.1.18</jtcop.version>
     <nexus-staging-maven-plugin.version>1.6.13</nexus-staging-maven-plugin.version>
-    <checkstyle.version>8.15</checkstyle.version>
+    <checkstyle.version>12.1.2</checkstyle.version>
     <maven-checkstyle-plugin.version>3.3.0</maven-checkstyle-plugin.version>
     <sa-tan.version>0.1.5</sa-tan.version>
     <maven-invoker-plugin.version>3.6.0</maven-invoker-plugin.version>