Remove hardcoded env from kernelspecs

[mcbarton]

Closes #430

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.28%. Comparing base (506b645) to head (7b10143).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #469   +/-   ##
=======================================
  Coverage   80.28%   80.28%           
=======================================
  Files          21       21           
  Lines         847      847           
  Branches       78       78           
=======================================
  Hits          680      680           
  Misses        167      167           

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[vgvassilev]

LGTM!