Bump maven-release-plugin from 3.0.0-M5 to 3.0.0-M6

Bumps [maven-release-plugin](https://github.com/apache/maven-release) from 3.0.0-M5 to 3.0.0-M6.
- [Release notes](https://github.com/apache/maven-release/releases)
- [Commits](apache/maven-release@maven-release-3.0.0-M5...maven-release-3.0.0-M6)

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

Signed-off-by: dependabot[bot] <[email protected]>

pom.xml

@@ -280,7 +280,7 @@ under the License.
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-release-plugin</artifactId>
-          <version>3.0.0-M5</version>
+          <version>3.0.0-M6</version>
         </plugin>
       </plugins>
     </pluginManagement>