Bump org.apache.maven.plugins:maven-source-plugin from 3.3.1 to 3.4.0 (#298)

Bumps [org.apache.maven.plugins:maven-source-plugin](https://github.com/apache/maven-source-plugin) from 3.3.1 to 3.4.0.
- [Release notes](https://github.com/apache/maven-source-plugin/releases)
- [Commits](apache/maven-source-plugin@maven-source-plugin-3.3.1...maven-source-plugin-3.4.0)

---
updated-dependencies:
- dependency-name: org.apache.maven.plugins:maven-source-plugin
  dependency-version: 3.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pom.xml

@@ -69,7 +69,7 @@
         <maven-jar-plugin.version>3.1.1</maven-jar-plugin.version>
         <maven-javadoc-plugin.version>3.12.0</maven-javadoc-plugin.version>
         <maven-resources-plugin.version>3.4.0</maven-resources-plugin.version>
-        <maven-source-plugin.version>3.3.1</maven-source-plugin.version>
+        <maven-source-plugin.version>3.4.0</maven-source-plugin.version>
         <maven-surefire-plugin.version>3.5.4</maven-surefire-plugin.version>
         <jacoco-maven-plugin.version>0.8.14</jacoco-maven-plugin.version>
         <central-publishing-maven-plugin.version>0.9.0</central-publishing-maven-plugin.version>