fix: do not widen body type on optional prop

[mrlubos]

Closes #625

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Name	Status	Preview	Comments	Updated (UTC)
hey-api-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 29, 2024 10:44am

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🦋 Changeset detected

Latest commit: 820002f

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

This PR includes changesets to release 2 packages

Name	Type
@hey-api/client-fetch	Patch
@example/openapi-ts-fetch	Patch

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.67%. Comparing base (3e72297) to head (820002f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #639   +/-   ##
=======================================
  Coverage   75.67%   75.67%           
=======================================
  Files          74       74           
  Lines        7400     7400           
  Branches      692      692           
=======================================
  Hits         5600     5600           
  Misses       1797     1797           
  Partials        3        3           

Flag	Coverage Δ
unittests	75.67% <ø> (ø)

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