Update urllib3 to 1.26.8

[pyup-bot]

This PR updates urllib3 from 1.26.7 to 1.26.8.

Changelog

1.26.8

-------------------

* Added extra message to ``urllib3.exceptions.ProxyError`` when urllib3 detects that
a proxy is configured to use HTTPS but the proxy itself appears to only use HTTP.
* Added a mention of the size of the connection pool when discarding a connection due to the pool being full.
* Added explicit support for Python 3.11.
* Deprecated the ``Retry.MAX_BACKOFF`` class property in favor of ``Retry.DEFAULT_MAX_BACKOFF``
to better match the rest of the default parameter names. ``Retry.MAX_BACKOFF`` is removed in v2.0.
* Changed location of the vendored ``ssl.match_hostname`` function from ``urllib3.packages.ssl_match_hostname``
to ``urllib3.util.ssl_match_hostname`` to ensure Python 3.10+ compatibility after being repackaged
by downstream distributors.
* Fixed absolute imports, all imports are now relative.

Links

• PyPI: https://pypi.org/project/urllib3
• Changelog: https://pyup.io/changelogs/urllib3/
• Docs: https://urllib3.readthedocs.io/

[codecov]

Codecov Report

Merging #189 (fefdea1) into main (436e1d1) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #189   +/-   ##
=======================================
  Coverage   86.85%   86.85%           
=======================================
  Files          21       21           
  Lines         289      289           
=======================================
  Hits          251      251           
  Misses         38       38           

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