Bump org.pitest:pitest-maven from 1.15.6 to 1.15.7

Bumps [org.pitest:pitest-maven](https://github.com/hcoles/pitest) from 1.15.6 to 1.15.7.
- [Release notes](https://github.com/hcoles/pitest/releases)
- [Commits](hcoles/pitest@1.15.6...1.15.7)

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

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

pom.xml

@@ -49,7 +49,7 @@
     <checkstyle.version>10.13.0</checkstyle.version>
     <maven-pmd-plugin.version>3.21.2</maven-pmd-plugin.version>
     <findsecbugs-plugin.version>1.12.0</findsecbugs-plugin.version>
-    <pitest-maven.plugin>1.15.6</pitest-maven.plugin>
+    <pitest-maven.plugin>1.15.7</pitest-maven.plugin>
     <pitest-maven.junit5.plugin>1.2.1</pitest-maven.junit5.plugin>
     <revapi-maven-plugin.version>0.15.0</revapi-maven-plugin.version>
     <revapi-java.version>0.28.1</revapi-java.version>