Fix caching of conda env in CI

[blink1073]

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[codecov-commenter]

Codecov Report

Merging #218 (34bbbb2) into master (f286ddf) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #218   +/-   ##
=======================================
  Coverage   76.96%   76.96%           
=======================================
  Files          28       28           
  Lines        2071     2071           
=======================================
  Hits         1594     1594           
  Misses        477      477           

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