build(deps): bump org.pitest:pitest-maven in /example

Bumps [org.pitest:pitest-maven](https://github.com/hcoles/pitest) from 1.20.5 to 1.21.0.
- [Release notes](https://github.com/hcoles/pitest/releases)
- [Commits](hcoles/pitest@1.20.5...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] <support@github.com>

Author: dependabot[bot]

example/pom.xml

@@ -31,7 +31,7 @@
     <jib-maven.plugin.version>3.4.6</jib-maven.plugin.version>
     <git-code-format-maven-plugin.version>5.4</git-code-format-maven-plugin.version>
     <githook-maven-plugin.version>1.0.5</githook-maven-plugin.version>
-    <pitest-maven-plugin.version>1.20.5</pitest-maven-plugin.version>
+    <pitest-maven-plugin.version>1.21.0</pitest-maven-plugin.version>
     <pitest-junit5-plugin.version>1.2.3</pitest-junit5-plugin.version>
   </properties>
   <modules>