Bump org.codehaus.plexus:plexus from 19 to 20

Bumps [org.codehaus.plexus:plexus](https://github.com/codehaus-plexus/plexus-pom) from 19 to 20. - [Release notes](https://github.com/codehaus-plexus/plexus-pom/releases) - [Commits](https://github.com/codehaus-plexus/plexus-pom/commits) --- updated-dependencies: - dependency-name: org.codehaus.plexus:plexus dependency-type: direct:production update-type: version-update:semver-major ... 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>19</version>
+ <version>20</version>
  </parent>
 
  <artifactId>plexus-archiver</artifactId>