Bump com.puppycrawl.tools:checkstyle in /vividus-studio-server (#538)

Bumps [com.puppycrawl.tools:checkstyle](https://github.com/checkstyle/checkstyle) from 10.12.4 to 10.12.6.
- [Release notes](https://github.com/checkstyle/checkstyle/releases)
- [Commits](checkstyle/checkstyle@checkstyle-10.12.4...checkstyle-10.12.6)

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

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

vividus-studio-server/vividus-studio-plugin/pom.xml

@@ -16,7 +16,7 @@
         <maven.compiler.target>17</maven.compiler.target>
         <org.mockito.version>5.8.0</org.mockito.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <checkstyle.version>10.12.4</checkstyle.version>
+        <checkstyle.version>10.12.6</checkstyle.version>
         <checkstyle.plugin.version>3.3.1</checkstyle.plugin.version>
         <sevntu.checkstyle.plugin.version>1.44.1</sevntu.checkstyle.plugin.version>
         <hamcrest.version>2.2</hamcrest.version>