update GitHub actions: setup-java to v4, wrapper-validation-action to v2 #2192
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The continuous integration at GitHub needs a few updates to address the recent deprecation of Node.js 16.
Recent CI summaries contain annotations of the following sort:
For example, see: https://github.com/jMonkeyEngine/jmonkeyengine/actions/runs/7747717155
If left unresolved, these issues might someday cause our continuous integration to fail.
This PR should resolve all or most of those annotations.