Bump org.codehaus.plexus:plexus-testing from 1.4.0 to 1.6.0

Bumps [org.codehaus.plexus:plexus-testing](https://github.com/codehaus-plexus/plexus-testing) from 1.4.0 to 1.6.0.
- [Release notes](https://github.com/codehaus-plexus/plexus-testing/releases)
- [Commits](codehaus-plexus/plexus-testing@plexus-testing-1.4.0...plexus-testing-1.6.0)

---
updated-dependencies:
- dependency-name: org.codehaus.plexus:plexus-testing
  dependency-version: 1.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pom.xml

@@ -278,7 +278,7 @@
       <dependency>
         <groupId>org.codehaus.plexus</groupId>
         <artifactId>plexus-testing</artifactId>
-        <version>1.4.0</version>
+        <version>1.6.0</version>
         <scope>test</scope>
       </dependency>
     </dependencies>