[MNG-7122] Require specific Maven compatibility version for plugins

**[Robert Scholte](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=rfscholte)** opened **[MNG-7122](https://issues.apache.org/jira/browse/MNG-7122?redirect=false)** and commented

By removing the WagonExcluder (MNG-7020) it could mean that plugins that rely on Maven2 dependencies might leak an old wagon-version onto the classpath.
Plugins can already define a prerequisite for the Maven version, but we also need a mechanism to do it the other way around: plugins should at least require maven dependencies of version x.

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**Issue Links:**
- [MNG-7020](https://issues.apache.org/jira/browse/MNG-7020) Remove Maven 2 WagonExcluder backward compat code
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1 votes, 5 watchers