Dataflake.wsgi.bjoern

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- Switch to PEP 420 implicit namespace support.

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- Add support for Python 3.12.

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- Drop support for Python 2.7, 3.5, 3.6.

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- Added support for Python 3.9 and 3.10

- Switched to GitHub Actions for CI
(`2 <https://github.com/dataflake/dataflake.wsgi.bjoern/issues/2>`_)

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- Added the ``listen`` parameter to pass a port or a host and port.
This is more in line with what ``plone.recipe.zope2instance`` expects.