Unpin dependency requests, upgrade to current v2.26.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
requests (source, changelog)	==2.25.1 -> ==2.26.0

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Release Notes

psf/requests

v2.26.0

Compare Source

Improvements

• Requests now supports Brotli compression, if either the brotli or
  brotlicffi package is installed. (#​5783)

• Session.send now correctly resolves proxy configurations from both
  the Session and Request. Behavior now matches Session.request. (#​5681)

Bugfixes

• Fixed a race condition in zip extraction when using Requests in parallel
  from zip archive. (#​5707)

Dependencies

• Instead of chardet, use the MIT-licensed charset_normalizer for Python3
  to remove license ambiguity for projects bundling requests. If chardet
  is already installed on your machine it will be used instead of charset_normalizer
  to keep backwards compatibility. (#​5797)

  You can also install chardet while installing requests by
  specifying [use_chardet_on_py3] extra as follows:

  pip install "requests[use_chardet_on_py3]"

  Python2 still depends upon the chardet module.

• Requests now supports idna 3.x on Python 3. idna 2.x will continue to
  be used on Python 2 installations. (#​5711)

Deprecations

• The requests[security] extra has been converted to a no-op install.
  PyOpenSSL is no longer the recommended secure option for Requests. (#​5867)

• Requests has officially dropped support for Python 3.5. (#​5867)

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