Bump pitest-maven from 1.8.0 to 1.8.1

Bumps [pitest-maven](https://github.com/hcoles/pitest) from 1.8.0 to 1.8.1.
- [Release notes](https://github.com/hcoles/pitest/releases)
- [Commits](hcoles/pitest@1.8.0...1.8.1)

---
updated-dependencies:
- dependency-name: org.pitest:pitest-maven
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -53,7 +53,7 @@
     <maven-jar-plugin.version>3.2.0</maven-jar-plugin.version>
     <maven-dependency-plugin.version>3.3.0</maven-dependency-plugin.version>
     <maven-resources-plugin.version>3.2.0</maven-resources-plugin.version>
-    <pitest-maven.plugin>1.8.0</pitest-maven.plugin>
+    <pitest-maven.plugin>1.8.1</pitest-maven.plugin>
     <pitest-maven.junit5.plugin>0.16</pitest-maven.junit5.plugin>
     <revapi-maven-plugin.version>0.14.6</revapi-maven-plugin.version>
     <revapi-java.version>0.26.1</revapi-java.version>