[Checkins] [zopefoundation/Zope] 9af2c0: Update to latest releases of dependencies.

[Michael Howitz]

  Branch: refs/heads/update-deps
  Home:   https://github.com/zopefoundation/Zope
  Commit: 9af2c04fa9d8854e74e5b3153fa03a23b4259c6d
      https://github.com/zopefoundation/Zope/commit/9af2c04fa9d8854e74e5b3153fa03a23b4259c6d
  Author: Michael Howitz <mh at gocept.com>
  Date:   2019-05-09 (Thu, 09 May 2019)

  Changed paths:
    M constraints.txt
    M requirements-full.txt
    M versions-prod.cfg
    M versions.cfg

  Log Message:
  -----------
  Update to latest releases of dependencies.