Bump pitest-maven from 1.6.3 to 1.6.7

Bumps [pitest-maven](https://github.com/hcoles/pitest) from 1.6.3 to 1.6.7.
- [Release notes](https://github.com/hcoles/pitest/releases)
- [Commits](hcoles/pitest@1.6.3...1.6.7)

---
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

@@ -86,7 +86,7 @@
     <spotbugs-maven-plugin.version>4.2.0</spotbugs-maven-plugin.version>
     <findsecbugs-plugin.version>1.11.0</findsecbugs-plugin.version>
     <jacoco-maven-plugin.version>0.8.6</jacoco-maven-plugin.version>
-    <maven-pitest-plugin.version>1.6.3</maven-pitest-plugin.version>
+    <maven-pitest-plugin.version>1.6.7</maven-pitest-plugin.version>
     <pitest-junit5-plugin.version>0.12</pitest-junit5-plugin.version>
     <error-prone.version>2.5.1</error-prone.version>
     <nullaway.version>0.9.0</nullaway.version>