Fix deploy CI job

[FreezyLemon]

Closes #3397.

proof that it works (the commit on that branch includes another change for testing).

GHA uses pwsh by default on Windows runners. Powershell uses backticks instead of backslashes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.14%. Comparing base (3c3a26f) to head (2fe5a2e).
Report is 32 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3399      +/-   ##
==========================================
- Coverage   88.52%   82.14%   -6.39%     
==========================================
  Files          89       89              
  Lines       28323    27408     -915     
==========================================
- Hits        25074    22515    -2559     
- Misses       3249     4893    +1644     

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[lu-zero]

Thank you!