Products.dcworkflow

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

- Add support for Python 3.11.

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New features:

- Add support for Python 3.10.

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New features:

- Add support for Python 3.9.

Bug fixes:

- Avoid a deprecation warning when importing ``gather_permissions``
(`20 <https://github.com/zopefoundation/Products.DCWorkflow/issues/20>`_)

- Avoid a TypeError when adding a managed group to a workflow
(`18 <https://github.com/zopefoundation/Products.DCWorkflow/issues/18>`_)

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- Added compatibility with Zope 5 by not registering for the help system.

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- full flake8 code cleanup