Bump maven-failsafe-plugin from 3.0.0-M4 to 3.0.0-M6

Bumps [maven-failsafe-plugin](https://github.com/apache/maven-surefire) from 3.0.0-M4 to 3.0.0-M6.
- [Release notes](https://github.com/apache/maven-surefire/releases)
- [Commits](apache/maven-surefire@surefire-3.0.0-M4...surefire-3.0.0-M6)

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

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

pom.xml

@@ -48,7 +48,7 @@
     <findsecbugs-plugin.version>1.12.0</findsecbugs-plugin.version>
     <jacoco-maven-plugin.version>0.8.7</jacoco-maven-plugin.version>
     <maven-surefire.plugin>3.0.0-M6</maven-surefire.plugin>
-    <maven-failsafe.plugin>3.0.0-M4</maven-failsafe.plugin>
+    <maven-failsafe.plugin>3.0.0-M6</maven-failsafe.plugin>
     <maven-javadoc-plugin.version>3.3.2</maven-javadoc-plugin.version>
     <maven-jar-plugin.version>3.2.0</maven-jar-plugin.version>
     <maven-dependency-plugin.version>3.3.0</maven-dependency-plugin.version>