fix: allow arbitrary object properties when additionalProperties is undefined

[mrlubos]

Closes #1381

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Name	Status	Preview	Comments	Updated (UTC)
hey-api-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 4, 2024 11:24pm

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🦋 Changeset detected

Latest commit: 8388c47

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	Minor

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[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 19 lines in your changes missing coverage. Please review.

Project coverage is 64.31%. Comparing base (7ee3960) to head (8388c47).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...ages/openapi-ts/src/openApi/3.0.x/parser/schema.ts	0.00%	19 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1390      +/-   ##
==========================================
- Coverage   64.31%   64.31%   -0.01%     
==========================================
  Files         140      140              
  Lines       21773    21781       +8     
  Branches     1834     1835       +1     
==========================================
+ Hits        14004    14008       +4     
- Misses       7763     7767       +4     
  Partials        6        6              

Flag	Coverage Δ
unittests	64.31% <50.00%> (-0.01%)	⬇️

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