Bump maven-source-plugin from 3.1.0 to 3.2.1

Bumps [maven-source-plugin](https://github.com/apache/maven-source-plugin) from 3.1.0 to 3.2.1.
- [Release notes](https://github.com/apache/maven-source-plugin/releases)
- [Commits](apache/maven-source-plugin@maven-source-plugin-3.1.0...maven-source-plugin-3.2.1)

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

Author: dependabot-preview[bot]

pom.xml

@@ -59,7 +59,7 @@
         <maven.gpg.plugin.version>1.6</maven.gpg.plugin.version>
         <maven.javadoc.plugin.version>3.1.1</maven.javadoc.plugin.version>
         <maven.release.plugin.version>2.5.3</maven.release.plugin.version>
-        <maven.source.plugin.version>3.1.0</maven.source.plugin.version>
+        <maven.source.plugin.version>3.2.1</maven.source.plugin.version>
         <maven.jarplugin.version>3.1.2</maven.jarplugin.version>
         <maven.nexus.staging.version>1.6.8</maven.nexus.staging.version>
         <maven.shade.version>3.2.1</maven.shade.version>