Update requests to 2.23.0

[pyup-bot]

This PR updates requests from 2.22.0 to 2.23.0.

Changelog

2.23.0

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

**Improvements**

- Remove defunct reference to `prefetch` in Session `__attrs__` (5110)

**Bugfixes**

- Requests no longer outputs password in basic auth usage warning. (5099)

**Dependencies**

- Pinning for `chardet` and `idna` now uses major version instead of minor.
This hopefully reduces the need for releases everytime a dependency is updated.

Links

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

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@9648034). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             master   #235   +/-   ##
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  Coverage          ?   100%           
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  Files             ?     12           
  Lines             ?    116           
  Branches          ?      0           
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  Hits              ?    116           
  Misses            ?      0           
  Partials          ?      0

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[pyup-bot]

Closing this in favor of #318