Authencoding

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- Fix schema sorting bug.

- Drop support for Python 2.7, 3.5, 3.6.

- Add support for Python 3.10 and 3.11.

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- Replace hand-rolled salt creation with ``os.urandom``
(`8 <https://github.com/zopefoundation/AuthEncoding/issues/8>`)

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- Test on GHA.

- Skip some tests for broken crypt implementations.

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- Add support for Python 3.8 and 3.9.

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- Add support for Python 3.6, 3.7 and PyPy3.

- Drop support for Python 2.6, 3.3 and 3.4.

- Add ``BCRYPTHashingScheme``, optionally available if package is
installed with the `bcrypt` extra.

- Accept bytes as input to ``AuthEncoding.is_encrypted``.