use zoneinfo instead of pytz where possible

[samuelcolvin]

No description provided.

[codecov]

Codecov Report

Merging #93 (250d307) into main (5da8ed1) will decrease coverage by 0.74%.
Report is 1 commits behind head on main.
The diff coverage is 60.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##              main      #93      +/-   ##
===========================================
- Coverage   100.00%   99.26%   -0.74%     
===========================================
  Files           12       12              
  Lines          814      820       +6     
  Branches       150      150              
===========================================
  Hits           814      814              
- Misses           0        6       +6     

Files	Coverage Δ
dirty_equals/_other.py	100.00% <100.00%> (ø)
dirty_equals/_datetime.py	93.68% <57.14%> (-6.32%)	⬇️

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