fix: make getHeaders() accept generic

[mrlubos]

Closes #706

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Name	Status	Preview	Comments	Updated (UTC)
hey-api-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 22, 2024 1:09am

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🦋 Changeset detected

Latest commit: 36cf95d

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 71.06%. Comparing base (c20c139) to head (36cf95d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #708   +/-   ##
=======================================
  Coverage   71.06%   71.06%           
=======================================
  Files          76       76           
  Lines        8034     8034           
  Branches      710      710           
=======================================
  Hits         5709     5709           
  Misses       2321     2321           
  Partials        4        4           

Flag	Coverage Δ
unittests	71.06% <ø> (ø)

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