Update pytz to 2021.3

[pyup-bot]

This PR updates pytz from 2020.1 to 2021.3.

The bot wasn't able to find a changelog for this release. Got an idea?

Links

• PyPI: https://pypi.org/project/pytz
• Homepage: http://pythonhosted.org/pytz
• Docs: https://pythonhosted.org/pytz/

[codecov]

Codecov Report

Merging #144 (ceff5a0) into master (8bb1566) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #144   +/-   ##
=======================================
  Coverage   78.42%   78.42%           
=======================================
  Files          26       26           
  Lines         533      533           
=======================================
  Hits          418      418           
  Misses        115      115           

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