Update maven-source-plugin to 3.3.1

Change-Id: I420f24086948b28328f7120c1b22f4de33da0e78

pom.xml

diff --git a/pom.xml b/pom.xml
index c3a39b2..0dd6ff2 100644
--- a/pom.xml
+++ b/pom.xml
@@ -232,7 +232,7 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-source-plugin</artifactId>
-          <version>3.3.0</version>
+          <version>3.3.1</version>
         </plugin>
 
         <plugin>