chore(deps): bump org.pitest:pitest-maven from 1.20.3 to 1.21.0

Bumps [org.pitest:pitest-maven](https://github.com/hcoles/pitest) from 1.20.3 to 1.21.0.
- [Release notes](https://github.com/hcoles/pitest/releases)
- [Commits](hcoles/pitest@1.20.3...1.21.0)

---
updated-dependencies:
- dependency-name: org.pitest:pitest-maven
  dependency-version: 1.21.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pom.xml

@@ -239,7 +239,7 @@
         <plugin>
           <groupId>org.pitest</groupId>
           <artifactId>pitest-maven</artifactId>
-          <version>1.20.3</version>
+          <version>1.21.0</version>
         </plugin>
         <plugin>
           <groupId>com.github.spotbugs</groupId>