Bump maven-javadoc-plugin from 3.3.0 to 3.3.1

Bumps [maven-javadoc-plugin](https://github.com/apache/maven-javadoc-plugin) from 3.3.0 to 3.3.1.
- [Release notes](https://github.com/apache/maven-javadoc-plugin/releases)
- [Commits](apache/maven-javadoc-plugin@maven-javadoc-plugin-3.3.0...maven-javadoc-plugin-3.3.1)

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

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

Author: dependabot[bot]

pom.xml

@@ -28,7 +28,7 @@
         <cobertura.version>2.7</cobertura.version>
         <checkstyle.version>2.11</checkstyle.version>
         <findbugs.version>3.0.5</findbugs.version>
-        <javadoc.version>3.3.0</javadoc.version>
+        <javadoc.version>3.3.1</javadoc.version>
         <pmd.version>3.14.0</pmd.version>
         <jdepend.version>2.0</jdepend.version>
         <javancss.version>2.0</javancss.version>