Remove duplicate plugin versions.

[ammachado]

What's changed?

Fixes #3932

What's your motivation?

Remove duplicate plugin versions from pom files updated by OpenRewrite

Anything in particular you'd like reviewers to focus on?

No

Anyone you would like to review specifically?

No

Have you considered any alternatives or workarounds?

No

Any additional context

No

Checklist

• [x] I've added unit tests to cover both positive and negative cases
• [x] I've read and applied the recipe conventions and best practices
• [x] I've used the IntelliJ IDEA auto-formatter on affected files