Zope

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- Add support for Python 3.10.

- Remove unused classes ``SecurityManager`` and ``RivilegedUser`` from
``.tests.testBindings``.

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- Make sure "Manager" users can always modify proxy roles
(`50 <https://github.com/zopefoundation/Products.PythonScripts/issues/50>`_)

- Add support for Python 3.9.

- Update configuration for version 5 of ``isort``.

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- Add a ``file`` parameter to factory function ``manage_addPythonScript``
(`45 <https://github.com/zopefoundation/Products.PythonScripts/issues/45>`_)

- Fix ``TypeError`` when updating an existing script from a file
(`43 <https://github.com/zopefoundation/Products.PythonScripts/issues/43>`_)

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- Fix ``PUT`` issues with string encoding.

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- Override ``manage_DAVget`` to get correct editable sources
(`40 <https://github.com/zopefoundation/Products.PythonScripts/issues/40>`_)

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- Prevent ResourceWarning/Error by closing default contents file
(`39 <https://github.com/zopefoundation/Products.PythonScripts/issues/39>`_)