Bump com.puppycrawl.tools:checkstyle in /lang/java (#3251)

Bumps [com.puppycrawl.tools:checkstyle](https://github.com/checkstyle/checkstyle) from 10.18.1 to 10.20.2.
- [Release notes](https://github.com/checkstyle/checkstyle/releases)
- [Commits](checkstyle/checkstyle@checkstyle-10.18.1...checkstyle-10.20.2)

---
updated-dependencies:
- dependency-name: com.puppycrawl.tools:checkstyle
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pom.xml

@@ -49,7 +49,7 @@
     <!-- plugin versions -->
     <apache-rat-plugin.version>0.16.1</apache-rat-plugin.version>
     <checkstyle-plugin.version>3.5.0</checkstyle-plugin.version>
-    <checkstyle.version>10.18.1</checkstyle.version>
+    <checkstyle.version>10.20.2</checkstyle.version>
     <enforcer-plugin.version>3.5.0</enforcer-plugin.version>
     <extra-enforcer-rules.version>1.8.0</extra-enforcer-rules.version>
     <maven-antrun-plugin.version>3.1.0</maven-antrun-plugin.version>