Urllib3-future

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* Deprecated the ``urllib3.contrib.ntlmpool`` module. urllib3 is not able to support
it properly due to `reasons listed in this issue <https://github.com/urllib3/urllib3/issues/2282>`_.
If you are a user of this module please leave a comment.
* Changed ``HTTPConnection.request_chunked()`` to not erroneously emit multiple
``Transfer-Encoding`` headers in the case that one is already specified.
* Fixed typo in deprecation message to recommend ``Retry.DEFAULT_ALLOWED_METHODS``.

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* Fixed deprecation warnings emitted in Python 3.10.
* Updated vendored ``six`` library to 1.16.0.
* Improved performance of URL parser when splitting
the authority component.

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* Changed behavior of the default ``SSLContext`` when connecting to HTTPS proxy
during HTTPS requests. The default ``SSLContext`` now sets ``check_hostname=True``.

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* Fixed bytes and string comparison issue with headers (Pull 2141)

* Changed ``ProxySchemeUnknown`` error message to be
more actionable if the user supplies a proxy URL without
a scheme. (Pull 2107)

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* Fixed an issue where ``wrap_socket`` and ``CERT_REQUIRED`` wouldn't
be imported properly on Python 2.7.8 and earlier (Pull 2052)

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* Fixed an issue where two ``User-Agent`` headers would be sent if a
``User-Agent`` header key is passed as ``bytes`` (Pull 2047)