Bump org.codehaus.plexus:plexus-classworlds from 2.6.0 to 2.8.0

Bumps [org.codehaus.plexus:plexus-classworlds](https://github.com/codehaus-plexus/plexus-classworlds) from 2.6.0 to 2.8.0.
- [Release notes](https://github.com/codehaus-plexus/plexus-classworlds/releases)
- [Commits](codehaus-plexus/plexus-classworlds@plexus-classworlds-2.6.0...plexus-classworlds-2.8.0)

---
updated-dependencies:
- dependency-name: org.codehaus.plexus:plexus-classworlds
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

doxia-site-renderer/pom.xml

@@ -155,7 +155,7 @@ under the License.
     <dependency>
       <groupId>org.codehaus.plexus</groupId>
       <artifactId>plexus-classworlds</artifactId>
-      <version>2.6.0</version>
+      <version>2.8.0</version>
       <scope>test</scope>
     </dependency>
     <dependency>