deps: Bump com.puppycrawl.tools:checkstyle from 13.5.0 to 13.6.0 (#200)

Bumps [com.puppycrawl.tools:checkstyle](https://github.com/checkstyle/checkstyle) from 13.5.0 to 13.6.0.
- [Release notes](https://github.com/checkstyle/checkstyle/releases)
- [Commits](checkstyle/checkstyle@checkstyle-13.5.0...checkstyle-13.6.0)

---
updated-dependencies:
- dependency-name: com.puppycrawl.tools:checkstyle
  dependency-version: 13.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]

hamcrest-mail/pom.xml

@@ -151,7 +151,7 @@
             <dependency>
               <groupId>com.puppycrawl.tools</groupId>
               <artifactId>checkstyle</artifactId>
-              <version>13.5.0</version>
+              <version>13.6.0</version>
             </dependency>
           </dependencies>
         </plugin>

pom.xml

@@ -68,7 +68,7 @@
             <dependency>
               <groupId>com.puppycrawl.tools</groupId>
               <artifactId>checkstyle</artifactId>
-              <version>13.5.0</version>
+              <version>13.6.0</version>
             </dependency>
           </dependencies>
         </plugin>