Products.standardcachemanagers

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- Fix insidious buildout configuration bug for tests against Zope 4.

- Add support for Python 3.10 and 3.11.

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- fix DeprecationWarning for rfc1123_date
(`8
<https://github.com/zopefoundation/Products.StandardCacheManagers/issues/8>`_)

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- Add support for Python 3.9.

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- More package cleanups.

- Cleaned up ZMI views for Zope 4.

- Fixed several errors due to changed behavior in Python 3.

- Update `isort` to version 5.

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- Specify supported Python versions using ``python_requires`` in setup.py

- Added support for Python 3.7 and 3.8

- Dropped support for Python 3.4 as Zope does not support it anymore

- More PEP8 compliance.