No need to call datetime.replace for utc_now

[EdwardBetts]

utc_now already has the timezone set to UTC, so calling replace(tzinfo=timezone.utc) is redundant

[codecov]

Codecov Report

Merging #95 (a5d1e20) into main (2c85486) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #95   +/-   ##
=======================================
  Coverage   99.26%   99.26%           
=======================================
  Files          12       12           
  Lines         820      820           
  Branches      150      150           
=======================================
  Hits          814      814           
  Misses          6        6           

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[samuelcolvin]

thanks so much.