fix: correctly detect corepack for fallback

[pxslip]

Reproduction steps can be found at #178 (comment)

resolves #178

[pxslip]

I was hoping to write a decent unit test for this, but couldn't come up with a solution that doesn't require rewriting GH Actions workflows. If someone has an idea I'd be happy to hear and implement it.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 64.77%. Comparing base (660392f) to head (7417c25).
Report is 73 commits behind head on main.

Files with missing lines	Patch %	Lines
src/_utils.ts	66.66%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #179       +/-   ##
===========================================
- Coverage   82.17%   64.77%   -17.40%     
===========================================
  Files           6        5        -1     
  Lines         516      494       -22     
  Branches       71       92       +21     
===========================================
- Hits          424      320      -104     
- Misses         91      171       +80     
- Partials        1        3        +2     

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[pi0]

Thnx!