[Checkins] [zopefoundation/Zope] 693926: - update waitress to 1.4.2

[Jens Vagelpohl]

  Branch: refs/heads/4.x
  Home:   https://github.com/zopefoundation/Zope
  Commit: 6939261f8d9e93c92b0f1dd54d961bb07306b399
      https://github.com/zopefoundation/Zope/commit/6939261f8d9e93c92b0f1dd54d961bb07306b399
  Author: Jens Vagelpohl <jens at netz.ooo>
  Date:   2020-01-06 (Mon, 06 Jan 2020)

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

  Log Message:
  -----------
  - update waitress to 1.4.2