Update South Carolina tax logic

[rickecon]

• make format and make documentation has been run. (You may also want to run make test.)

This PR:

• Updates South Carolina tax logic and tests
• Replaces Mambaforge Python installer with Miniforge in GH Actions

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.44%. Comparing base (d72aef2) to head (a8c9f4d).
Report is 22 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #82      +/-   ##
==========================================
- Coverage   98.45%   98.44%   -0.02%     
==========================================
  Files        1802     1840      +38     
  Lines       26697    27088     +391     
  Branches      142      142              
==========================================
+ Hits        26285    26667     +382     
- Misses        381      390       +9     
  Partials       31       31              

Flag	Coverage Δ
unittests	98.44% <100.00%> (-0.02%)	⬇️

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