Bump org.apache.maven.plugins:maven-surefire-plugin from 3.5.5 to 3.5.6 (#228)

Bumps [org.apache.maven.plugins:maven-surefire-plugin](https://github.com/apache/maven-surefire) from 3.5.5 to 3.5.6.
- [Release notes](https://github.com/apache/maven-surefire/releases)
- [Commits](apache/maven-surefire@surefire-3.5.5...surefire-3.5.6)

---
updated-dependencies:
- dependency-name: org.apache.maven.plugins:maven-surefire-plugin
  dependency-version: 3.5.6
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

pom.xml

@@ -57,7 +57,7 @@
 
         <!--    plugin properties   -->
         <version.jacoco-maven-plugin>0.8.14</version.jacoco-maven-plugin>
-        <version.maven-surefire-plugin>3.5.5</version.maven-surefire-plugin>
+        <version.maven-surefire-plugin>3.5.6</version.maven-surefire-plugin>
         <version.maven-compiler-plugin>3.15.0</version.maven-compiler-plugin>
         <version.maven-jar-plugin>3.5.0</version.maven-jar-plugin>
         <version.maven-javadoc-plugin>3.12.0</version.maven-javadoc-plugin>