(v2.2.x): Bump org.apache.maven.plugins:maven-source-plugin (#815)

Bumps [org.apache.maven.plugins:maven-source-plugin](https://github.com/apache/maven-source-plugin) from 3.3.0 to 3.3.1.
- [Commits](apache/maven-source-plugin@maven-source-plugin-3.3.0...maven-source-plugin-3.3.1)

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

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Author: dependabot[bot]

Diff for: pom.xml

@@ -337,7 +337,7 @@
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-source-plugin</artifactId>
-                    <version>3.3.0</version>
+                    <version>3.3.1</version>
                 </plugin>
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>