Bump maven-checkstyle-plugin from 2.17 to 3.3.0 (#124)

Bumps [maven-checkstyle-plugin](https://github.com/apache/maven-checkstyle-plugin) from 2.17 to 3.3.0.
- [Commits](apache/maven-checkstyle-plugin@maven-checkstyle-plugin-2.17...maven-checkstyle-plugin-3.3.0)

---
updated-dependencies:
- dependency-name: org.apache.maven.plugins:maven-checkstyle-plugin
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

klass-shared/pom.xml

@@ -29,7 +29,7 @@
         <java.version>1.8</java.version>
 
         <findbugs-version>3.0.5</findbugs-version>
-        <checkstyle-version>2.17</checkstyle-version>
+        <checkstyle-version>3.3.0</checkstyle-version>
         <spring.version>4.3.7.RELEASE</spring.version>
         <objenesis-version>3.3</objenesis-version>
         <guava-version>19.0</guava-version>