Install codecov uploader from PyPI in CI workflow

[smkent]

codecov/codecov-action#1955

[spomichter]

Reccomend pinning version for supply chain hack safety

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.37%. Comparing base (4b52b9f) to head (73bcba8).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #72   +/-   ##
=======================================
  Coverage   85.37%   85.37%           
=======================================
  Files           4        4           
  Lines         212      212           
  Branches       20       20           
=======================================
  Hits          181      181           
  Misses         21       21           
  Partials       10       10           

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[spomichter]

This is my fix : dimensionalOS/dimos#2399

[smkent]

@spomichter Done. Good suggestion, thanks!