Ldif

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- Update dependencies
- Update typing idioms to Python >= 3.9.

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- Update dependencies
- This removes support for Python < 3.9.

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- Update for Python 3.10.

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- Fix documentation generation -> `<https://ldif.readthedocs.io/>`_.

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- Add type annotations.

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- Take over the maintenance of this package as we need if for our
customers (see: `<https://github.com/abilian/labandco>`_ ).
- Drop Python 2 support.