Bump maven-checkstyle-plugin from 2.12.1 to 3.2.0

Bumps [maven-checkstyle-plugin](https://github.com/apache/maven-checkstyle-plugin) from 2.12.1 to 3.2.0.
- [Release notes](https://github.com/apache/maven-checkstyle-plugin/releases)
- [Commits](https://github.com/apache/maven-checkstyle-plugin/compare/maven-checkstyle-plugin-2.12.1...maven-checkstyle-plugin-3.2.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/pom.xml b/pom.xml
index 8172ff9..d2ce335 100644
--- a/pom.xml
+++ b/pom.xml
@@ -246,7 +246,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-checkstyle-plugin</artifactId>
-        <version>2.12.1</version>
+        <version>3.2.0</version>
       </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>