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

Bumps [org.pitest:pitest-maven](https://github.com/hcoles/pitest) from 1.19.1 to 1.20.6.
- [Release notes](https://github.com/hcoles/pitest/releases)
- [Commits](hcoles/pitest@1.19.1...1.20.6)

---
updated-dependencies:
- dependency-name: org.pitest:pitest-maven
  dependency-version: 1.20.6
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

example/pom.xml

@@ -30,7 +30,7 @@
     <jib-maven.plugin.version>3.4.5</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>1.19.1</pitest-maven-plugin.version>
+    <pitest-maven-plugin.version>1.20.6</pitest-maven-plugin.version>
     <pitest-junit5-plugin.version>1.2.2</pitest-junit5-plugin.version>
   </properties>
   <modules>