ci: try fixing venv install

[Wirg]

[codecov-commenter]

Codecov Report

Merging #55 (df80bfe) into main (e6ee613) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #55   +/-   ##
=======================================
  Coverage   97.77%   97.77%           
=======================================
  Files           2        2           
  Lines          45       45           
=======================================
  Hits           44       44           
  Misses          1        1           

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