Merge pull request #17 from pac4j/renovate/org.apache.maven.plugins-maven-source-plugin-3.x

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

Author: renovate[bot]

pom.xml

@@ -98,7 +98,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-source-plugin</artifactId>
-                <version>3.0.1</version>
+                <version>3.3.1</version>
                 <executions>
                     <execution>
                         <id>attach-sources</id>