Bump checkstyle from 10.2 to 10.3

Bumps [checkstyle](https://github.com/checkstyle/checkstyle) from 10.2 to 10.3.
- [Release notes](https://github.com/checkstyle/checkstyle/releases)
- [Commits](checkstyle/checkstyle@checkstyle-10.2...checkstyle-10.3)

---
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>

pom.xml

@@ -91,7 +91,7 @@
         <hamcrest.version>2.2</hamcrest.version>
         <junit.version>5.8.2</junit.version>
         <mockito.version>4.5.1</mockito.version>
-        <checkstyle.version>10.2</checkstyle.version>
+        <checkstyle.version>10.3</checkstyle.version>
         <maven-jxr-plugin.version>3.2.0</maven-jxr-plugin.version>
     </properties>