Merge pull request #22 from opentripplanner/renovate/maven-source-plugin.version

Update dependency org.apache.maven.plugins:maven-source-plugin to v3.4.0

Author: leonardehrenfried

pom.xml

@@ -74,7 +74,7 @@
     <!-- Maven plugin versions  -->
     <maven-exec-plugin.version>1.6.0</maven-exec-plugin.version>
     <maven-surefire-plugin.version>2.22.2</maven-surefire-plugin.version>
-    <maven-source-plugin.version>3.2.1</maven-source-plugin.version>
+    <maven-source-plugin.version>3.4.0</maven-source-plugin.version>
     <maven-javadoc-plugin.version>3.12.0</maven-javadoc-plugin.version>
     <maven-release-plugin.version>3.3.1</maven-release-plugin.version>
     <maven-gpg-plugin.version>1.6</maven-gpg-plugin.version>