Zope.app.basicskin

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- Nothing changed yet.

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- Drop support for Python 2.7, 3.4, 3.5, 3.6.

- Add support for Python 3.7, 3.8, 3.9, 3.10, 3.11.

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- Add support for Python 3.4, 3.5, and 3.6.
- Add support for PyPy.

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- Added test extra to declare test dependency on ``zope.component [test]``.

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- Avoid extraneous testing dependencies and remove test extra.

- Avoid zope.app.component testing dependency.

- Removed BBB import for IBasicSkin.

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- Added missing test dependency: zope.app.component.