Update dependency org.apache.maven.plugins:maven-source-plugin to v3.3.1

Author: renovate[bot]

pom.xml

@@ -53,7 +53,7 @@
 		<!-- Maven Central Release tools -->
 		<versions-maven-plugin.version>2.8.1</versions-maven-plugin.version>
 		<maven-gpg-plugin.version>1.6</maven-gpg-plugin.version>
-		<maven-source-plugin.version>3.2.1</maven-source-plugin.version>
+		<maven-source-plugin.version>3.3.1</maven-source-plugin.version>
 		<maven-javadoc-plugin.version>3.2.0</maven-javadoc-plugin.version>
 		<nexus-staging-maven-plugin.version>1.6.8</nexus-staging-maven-plugin.version>
     </properties>