Bump plexus from 6.5 to 7

Bumps [plexus](https://github.com/codehaus-plexus/plexus-pom) from 6.5 to 7.
- [Release notes](https://github.com/codehaus-plexus/plexus-pom/releases)
- [Commits](https://github.com/codehaus-plexus/plexus-pom/commits)

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

Author: dependabot[bot]

pom.xml

@@ -5,7 +5,7 @@
   <parent>
     <groupId>org.codehaus.plexus</groupId>
     <artifactId>plexus</artifactId>
-    <version>6.5</version>
+    <version>7</version>
   </parent>
 
   <artifactId>plexus-languages</artifactId>