[zope] Zope 5.6 released

On behalf of Zope developer community I am pleased to announce the release of Zope 5.6. This bugfix release cleans up several smaller issues and will be the base for the second Plone 6 beta release. It also starts compatibility work for Python 3.11 so you can test your own Zope projects against it. Official Python 3.11 support will arrive soon. For the full list of changes see the change log at https://zope.readthedocs.io/en/latest/changes.html#id1. Installation instructions can be found at https://zope.readthedocs.io/en/latest/INSTALL.html. Jens Vagelpohl