Update maven-source-plugin to 3.0.1 to fix OOM during build

Recently we frequently suffer from OutOfMemoryError when creating source
archives in the Maven build. maven-source-plugin 3.0.0 has a bug [1]
causing OOM which is fixed in 3.0.1.

[1] https://issues.apache.org/jira/browse/MSOURCES-94

Change-Id: Ie900bd546c42523c5a04e22bd3d3f510d2a81ca2
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

pom.xml

@@ -339,7 +339,7 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-source-plugin</artifactId>
-          <version>3.0.0</version>
+          <version>3.0.1</version>
         </plugin>
 
         <plugin>