Update dependency org.apache.maven.plugins:maven-source-plugin to v3.4.0 (#827)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

pom.xml

@@ -71,7 +71,7 @@
 		<maven-javadoc-plugin.version>3.12.0</maven-javadoc-plugin.version>
 		<maven-release-plugin.version>3.2.0</maven-release-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>
 		<maven-war-plugin.version>3.5.1</maven-war-plugin.version>
 		<!-- dependency versions -->