dependency: bump pitest-maven from 1.8.1 to 1.9.0

Bumps [pitest-maven](https://github.com/hcoles/pitest) from 1.8.1 to 1.9.0.
- [Release notes](https://github.com/hcoles/pitest/releases)
- [Commits](hcoles/pitest@1.8.1...1.9.0)

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

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

pom.xml

@@ -214,7 +214,7 @@
     </maven.sevntu-checkstyle-check.checkstyle.version>
     <maven.versions.plugin.version>2.11.0</maven.versions.plugin.version>
     <java.version>11</java.version>
-    <pitest.plugin.version>1.8.1</pitest.plugin.version>
+    <pitest.plugin.version>1.9.0</pitest.plugin.version>
     <pitest.plugin.timeout.factor>10</pitest.plugin.timeout.factor>
     <pitest.plugin.timeout.constant>50000</pitest.plugin.timeout.constant>
     <pitest.plugin.threads>4</pitest.plugin.threads>