perf: replace @rollup/pluginutils with unplugin-utils

[sxzz]

See unjs/unimport#427

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 57.87%. Comparing base (9386846) to head (7105a07).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/data-loaders/auto-exports.ts	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #579   +/-   ##
=======================================
  Coverage   57.87%   57.87%           
=======================================
  Files          32       32           
  Lines        3138     3138           
  Branches      562      562           
=======================================
  Hits         1816     1816           
  Misses       1315     1315           
  Partials        7        7           

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