fix(package): force utf-8 in setup

[tyteen4a03]

Change Summary

Changes setup.py to always open files in UTF-8 encoding to avoid weird encoding errors when installing the package.

Checklist

N/A

Agreement

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[codecov]

Codecov Report

Merging #491 (8f844eb) into main (1fb27b4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #491   +/-   ##
=======================================
  Coverage   94.23%   94.23%           
=======================================
  Files         120      120           
  Lines        6015     6015           
  Branches     1022     1022           
=======================================
  Hits         5668     5668           
  Misses        305      305           
  Partials       42       42           

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[RobertCraigie]

Thank you! 💜