fix: handle references to schemas with illegal names

[mrlubos]

Closes #768

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Name	Status	Preview	Comments	Updated (UTC)
hey-api-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 17, 2024 0:46am

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🦋 Changeset detected

Latest commit: 20759e2

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 80.55556% with 14 lines in your changes missing coverage. Please review.

Project coverage is 73.95%. Comparing base (274851b) to head (20759e2).

Files	Patch %	Lines
packages/openapi-ts/src/utils/type.ts	12.50%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #786      +/-   ##
==========================================
- Coverage   74.00%   73.95%   -0.05%     
==========================================
  Files          77       79       +2     
  Lines        8359     8393      +34     
  Branches      781      783       +2     
==========================================
+ Hits         6186     6207      +21     
- Misses       2169     2182      +13     
  Partials        4        4              

Flag	Coverage Δ
unittests	73.95% <80.55%> (-0.05%)	⬇️

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