Jsonschema

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* Update some documentation examples to use newer validator releases in their
sample code.

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* Fix relative ``$ref`` resolution when the base URI is a URN or other scheme
(544).
* ``pkgutil.resolve_name`` is now used to retrieve validators
provided on the command line. This function is only available on
3.9+, so 3.7 and 3.8 (which are still supported) now rely on the
`pkgutil_resolve_name <https://pypi.org/project/pkgutil_resolve_name/>`_
backport package. Note however that the CLI itself is due
to be deprecated shortly in favor of `check-jsonschema
<https://github.com/python-jsonschema/check-jsonschema>`_.

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* ``best_match`` no longer traverses into ``anyOf`` and ``oneOf`` when all of
the errors within them seem equally applicable. This should lead to clearer
error messages in some cases where no branches were matched.

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* Also have ``best_match`` handle cases where the ``type`` validator is an
array.

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* Minor tweak of the PyPI hyperlink names

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* Enhance ``best_match`` to prefer errors from branches of the schema which
match the instance's type (728)