build(deps): bump maven-checkstyle-plugin from 3.2.0 to 3.2.1

Bumps [maven-checkstyle-plugin](https://github.com/apache/maven-checkstyle-plugin) from 3.2.0 to 3.2.1.
- [Release notes](https://github.com/apache/maven-checkstyle-plugin/releases)
- [Commits](apache/maven-checkstyle-plugin@maven-checkstyle-plugin-3.2.0...maven-checkstyle-plugin-3.2.1)

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

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

Author: dependabot[bot]

canteen/pom.xml

@@ -64,7 +64,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-checkstyle-plugin</artifactId>
-                <version>3.2.0</version>
+                <version>3.2.1</version>
                 <dependencies>
                     <dependency>
                         <groupId>com.puppycrawl.tools</groupId>

contrib/pom.xml

@@ -246,7 +246,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-checkstyle-plugin</artifactId>
-                <version>3.2.0</version>
+                <version>3.2.1</version>
                 <dependencies>
                     <dependency>
                         <groupId>com.puppycrawl.tools</groupId>

demos/pom.xml

@@ -157,7 +157,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-checkstyle-plugin</artifactId>
-                <version>3.2.0</version>
+                <version>3.2.1</version>
                 <dependencies>
                     <dependency>
                         <groupId>com.puppycrawl.tools</groupId>

jprotoc/pom.xml

@@ -202,7 +202,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-checkstyle-plugin</artifactId>
-                <version>3.2.0</version>
+                <version>3.2.1</version>
                 <dependencies>
                     <dependency>
                         <groupId>com.puppycrawl.tools</groupId>