fix: add overloads for defineConfig to improve type inference

[hyoban]

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🦋 Changeset detected

Latest commit: 05e5dc4

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

This PR includes changesets to release 1 package

Name	Type
@hey-api/openapi-ts	Patch

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 35.74%. Comparing base (81e98e4) to head (05e5dc4).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3263   +/-   ##
=======================================
  Coverage   35.74%   35.74%           
=======================================
  Files         454      454           
  Lines       34650    34650           
  Branches     2475     2475           
=======================================
  Hits        12385    12385           
  Misses      22236    22236           
  Partials       29       29           

Flag	Coverage Δ
unittests	35.74% <ø> (ø)

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