fix: avoid using fs/promises

[benmccann]

It might be less reliable since it's newer? (example: nodejs/node#51031)

People are reporting weird errors (sveltejs/kit#11098) and this is my best guess at the moment

[changeset-bot]

🦋 Changeset detected

Latest commit: 86967b9

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
vite-imagetools	Patch

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[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (0df85ac) 93.60% compared to head (86967b9) 93.60%.

Files	Patch %	Lines
packages/vite/src/utils.ts	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #675   +/-   ##
=======================================
  Coverage   93.60%   93.60%           
=======================================
  Files          32       32           
  Lines        1189     1189           
  Branches      189      189           
=======================================
  Hits         1113     1113           
  Misses         76       76           

Flag	Coverage Δ
imagetools-core	97.01% <ø> (ø)
vite-imagetools	78.44% <50.00%> (ø)

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