build(deps): bump checkstyle in /sevntu-checkstyle-sonar-plugin

Bumps [checkstyle](https://github.com/checkstyle/checkstyle) from 8.27 to 8.29.
- [Release notes](https://github.com/checkstyle/checkstyle/releases)
- [Commits](checkstyle/checkstyle@checkstyle-8.27...checkstyle-8.29)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

sevntu-checkstyle-sonar-plugin/pom.xml

@@ -26,7 +26,7 @@
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <checkstyle.version>8.27</checkstyle.version>
+    <checkstyle.version>8.29</checkstyle.version>
     <checkstyle.plugin.version>3.1.0</checkstyle.plugin.version>
     <sonar.version>7.9</sonar.version>
     <staxmate.version>2.0.1</staxmate.version>