update conda cache fingerprint

[bjlittle]

Just to cover ourselves, let's add the uname -r to the conda cache fingerprint

[codecov]

Codecov Report

Merging #50 (0c563d9) into main (29ee08f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #50   +/-   ##
=======================================
  Coverage   96.47%   96.47%           
=======================================
  Files           9        9           
  Lines         340      340           
=======================================
  Hits          328      328           
  Misses         12       12           

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