fix: transformers handle allOf composition in experimental parser

[mrlubos]

Closes #1259

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🦋 Changeset detected

Latest commit: b358e23

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

Attention: Patch coverage is 18.18182% with 72 lines in your changes missing coverage. Please review.

Project coverage is 65.12%. Comparing base (7ae5eb1) to head (b358e23).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...api-ts/src/plugins/@hey-api/transformers/plugin.ts	4.25%	45 Missing ⚠️
...ages/openapi-ts/src/openApi/3.0.x/parser/schema.ts	0.00%	20 Missing ⚠️
...ages/openapi-ts/src/openApi/3.1.x/parser/schema.ts	65.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1382      +/-   ##
==========================================
- Coverage   65.24%   65.12%   -0.12%     
==========================================
  Files         140      140              
  Lines       21632    21684      +52     
  Branches     1863     1865       +2     
==========================================
+ Hits        14113    14122       +9     
- Misses       7515     7558      +43     
  Partials        4        4              

Flag	Coverage Δ
unittests	65.12% <18.18%> (-0.12%)	⬇️

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