Bump maven-source-plugin from 3.0.1 to 3.2.1 (#57)

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)

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Author: dependabot[bot]

pom.xml

@@ -592,7 +592,7 @@
                     <plugin>
                         <groupId>org.apache.maven.plugins</groupId>
                         <artifactId>maven-source-plugin</artifactId>
-                        <version>3.0.1</version>
+                        <version>3.2.1</version>
                         <executions>
                             <execution>
                                 <id>attach-sources</id>