[Checkins] [zopefoundation/Zope] 564dfb: Update to secure version

[Michael Howitz]

  Branch: refs/heads/icemac-patch-1
  Home:   https://github.com/zopefoundation/Zope
  Commit: 564dfb3fa79ae76b8e1c5e17a28376d3f0cf3e85
      https://github.com/zopefoundation/Zope/commit/564dfb3fa79ae76b8e1c5e17a28376d3f0cf3e85
  Author: Michael Howitz <mh at gocept.com>
  Date:   2019-05-02 (Thu, 02 May 2019)

  Changed paths:
    M versions.cfg

  Log Message:
  -----------
  Update to secure version

https://requires.io/github/zopefoundation/Zope/requirements/?branch=master indicates the used version as insecure.