fix: set_response_header breaking openapi doc rendering

[VishnuSanal]

Description

This PR fixes #976

Summary

This PR fixes set_response_header breaking openapi doc rendering

PR Checklist

Please ensure that:

• The PR contains a descriptive title
• The PR contains a descriptive summary of the changes
• You build and test your changes before submitting a PR.
• You have added relevant documentation
• You have added relevant tests. We prefer integration tests wherever possible

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[vercel]

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[codspeed-hq]

CodSpeed Performance Report

Merging #977 will not alter performance

_{Comparing VishnuSanal:fix-content-type-openapi (c43ef44) with main (40f7f0a)}

Summary

✅ 145 untouched benchmarks

[VishnuSanal]

@kigawas can you have a look here?

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[sansyrox]

Hey @VishnuSanal

I have some follow ups

[sansyrox]

Hey @VishnuSanal ,

Can you fetch the latest changes here?

[sansyrox]

LGTM !

Good job @VishnuSanal ✨