Bump maven-enforcer-plugin from 3.0.0-M3 to 3.2.1

Bumps [maven-enforcer-plugin](https://github.com/apache/maven-enforcer) from 3.0.0-M3 to 3.2.1.
- [Release notes](https://github.com/apache/maven-enforcer/releases)
- [Commits](https://github.com/apache/maven-enforcer/compare/enforcer-3.0.0-M3...enforcer-3.2.1)

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

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/pom.xml b/pom.xml
index 6190175..61f6c9d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -163,7 +163,7 @@
         </plugin>
         <plugin>
           <artifactId>maven-enforcer-plugin</artifactId>
-          <version>3.0.0-M3</version>
+          <version>3.2.1</version>
         </plugin>
         <plugin>
           <artifactId>maven-javadoc-plugin</artifactId>
@@ -188,7 +188,7 @@
     <plugins>
       <plugin>
         <artifactId>maven-enforcer-plugin</artifactId>
-        <version>3.0.0-M3</version>
+        <version>3.2.1</version>
         <executions>
           <execution>
             <id>enforce-bytecode-version</id>