Bump maven-source-plugin from 3.0.1 to 3.2.1

Bumps [maven-source-plugin](https://github.com/apache/maven-source-plugin) from 3.0.1 to 3.2.1.
- [Release notes](https://github.com/apache/maven-source-plugin/releases)
- [Commits](apache/maven-source-plugin@maven-source-plugin-3.0.1...maven-source-plugin-3.2.1)

---
updated-dependencies:
- dependency-name: org.apache.maven.plugins:maven-source-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pom.xml

@@ -70,7 +70,7 @@
     <maven.release.plugin.version>2.5.3</maven.release.plugin.version>
     <versions.maven.plugin.version>2.3</versions.maven.plugin.version>
     <maven.resources.plugin.version>3.1.0</maven.resources.plugin.version>
-    <maven.source.plugin.version>3.0.1</maven.source.plugin.version>
+    <maven.source.plugin.version>3.2.1</maven.source.plugin.version>
     <groovy.maven.plugin.version>2.1.1</groovy.maven.plugin.version>
     <groovy.all.version>2.4.8</groovy.all.version>
     <keytool.maven.plugin.version>1.5</keytool.maven.plugin.version>