fix(clients): annotate serializer return types

[mrlubos]

Closes #2271

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Name	Status	Preview	Comments	Updated (UTC)
hey-api-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 4, 2025 10:03pm

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🦋 Changeset detected

Latest commit: 25fc54c

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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commit: 25fc54c

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Codecov Report

Attention: Patch coverage is 22.22222% with 7 lines in your changes missing coverage. Please review.

Project coverage is 24.04%. Comparing base (63645d0) to head (25fc54c).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...gins/@hey-api/client-core/bundle/bodySerializer.ts	22.22%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2277      +/-   ##
==========================================
- Coverage   24.05%   24.04%   -0.01%     
==========================================
  Files         313      313              
  Lines       28892    28896       +4     
  Branches     1227     1227              
==========================================
  Hits         6949     6949              
- Misses      21934    21938       +4     
  Partials        9        9              

Flag	Coverage Δ
unittests	24.04% <22.22%> (-0.01%)	⬇️

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