Upgrade maven-source-plugin to 3.2.1

Change-Id: I01b0e6cc71f841680bc4116502837af2519379f9
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

pom.xml

@@ -285,7 +285,7 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-source-plugin</artifactId>
-          <version>3.2.0</version>
+          <version>3.2.1</version>
         </plugin>
 
         <plugin>