Bump org.apache.maven.plugins:maven-source-plugin from 3.0.1 to 3.3.1 (#30)

Bumps [org.apache.maven.plugins:maven-source-plugin](https://github.com/apache/maven-source-plugin) from 3.0.1 to 3.3.1.
- [Release notes](https://github.com/apache/maven-source-plugin/releases)
- [Commits](apache/maven-source-plugin@maven-source-plugin-3.0.1...maven-source-plugin-3.3.1)

---
updated-dependencies:
- dependency-name: org.apache.maven.plugins:maven-source-plugin
  dependency-version: 3.3.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]

pom.xml

@@ -39,7 +39,7 @@
         <maven.plugin.repository.version>2.3.1</maven.plugin.repository.version>
         <maven.clean.plugin.version>3.1.0</maven.clean.plugin.version>
         <maven.javadoc.plugin.version>3.0.1</maven.javadoc.plugin.version>
-        <maven.source.version>3.0.1</maven.source.version>
+        <maven.source.version>3.3.1</maven.source.version>
     </properties>
 
     <dependencies>