Update dependency org.apache.maven.plugins:maven-source-plugin to v3 (#681)

Author: renovate-bot

pom.xml

@@ -284,7 +284,7 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-source-plugin</artifactId>
-          <version>2.4</version>
+          <version>3.1.0</version>
           <executions>
             <execution>
               <id>attach-sources</id>