CI update pixi setup

[MatthewSZhang]

Checklist

• Used a personal fork to propose changes
• A reference to a related issue: CI update pixi setup #111
• A description of the changes: update pixi setup

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (84b2f83) to head (0e93a37).
⚠️ Report is 65 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #112   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines          603       612    +9     
=========================================
+ Hits           603       612    +9     

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