[Checkins] [zopefoundation/Zope] 004536: Use checkout of RestrictedPython. (#814)

[Michael Howitz]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/Zope
  Commit: 00453618df6aee523a87099561c02a013267a5b4
      https://github.com/zopefoundation/Zope/commit/00453618df6aee523a87099561c02a013267a5b4
  Author: Michael Howitz <mh at gocept.com>
  Date:   2020-06-30 (Tue, 30 Jun 2020)

  Changed paths:
    M buildout.cfg

  Log Message:
  -----------
  Use checkout of RestrictedPython. (#814)

This hopefully fixes Python 3.9.