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] <support@github.com>

pom.xml

@@ -92,7 +92,7 @@
         <version.maven-gpg-plugin>3.0.1</version.maven-gpg-plugin>
         <version.nexus-staging-maven-plugin>1.6.13</version.nexus-staging-maven-plugin>
         <version.versions-maven-plugin>2.11.0</version.versions-maven-plugin>
-        <version.maven-release-plugin>3.0.0-M5</version.maven-release-plugin>
+        <version.maven-release-plugin>3.0.0-M6</version.maven-release-plugin>
         <version.spotbugs-maven-plugin>4.7.0.0</version.spotbugs-maven-plugin>
         <version.spotbugs>4.7.0</version.spotbugs>