Plone 5.2.1 soft-released

I am running into an infinite setuptools restart, going from 5.2-latest

As described here:

adding the following to buildout.cfg stopped the looping

[versions]
setuptools =

While doing a dry-run upgrade, I saw this:

/usr/local/Plone52/zeocluster/eggs/Products.CMFPlone-5.2.1rc2-py3.7.egg/Products/CMFPlone/resources/browser/combine.py:53: DeprecationWarning: The 'warn' method is deprecated, use 'warning' instead
  logger.warn(u'Could not find resource {0}. You may have to create it first.'.format(path))  # noqa
2019-12-21 08:23:04,169 WARNING [Products.CMFPlone.resources.browser.combine:53][waitress] Could not find resource ++plone++static/plone-datatables-compiled.css. You may have to create it first.