Create CI_fixed.yaml

[jmbhughes]

Creates pinned environment CI

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.54%. Comparing base (b7472a0) to head (21a998b).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #167      +/-   ##
==========================================
+ Coverage   92.18%   95.54%   +3.35%     
==========================================
  Files           9       15       +6     
  Lines         550     1009     +459     
==========================================
+ Hits          507      964     +457     
- Misses         43       45       +2     

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