Fix OpenAPI response showing as JSON instead of YAML

[spastorelli]

No description provided.

[linear]

RND-8183 YAML response appears as JSON when it should be YAML

[changeset-bot]

🦋 Changeset detected

Latest commit: a2b1e14

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@gitbook/react-openapi	Patch
gitbook	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

Summary of the deployments:

Version	URL	Status
Vercel	https://gitbook-v2-aj7olx7oj-gitbook.vercel.app	✅
Cloudflare	https://69e6b4cf-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	2v	2c
GitBook	https://gitbook-v2-aj7olx7oj-gitbook.vercel.app/url/gitbook.com/docs	https://69e6b4cf-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://gitbook-v2-aj7olx7oj-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://69e6b4cf-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.gitbook.io/test-gitbook-open

[argos-ci]

The latest updates on your projects. Learn more about Argos notifications ↗︎

Build	Status	Details	Updated (UTC)
customers-v2 (Inspect)	👍 Changes approved	8 changed	Sep 18, 2025, 4:34 PM
v2-cloudflare (Inspect)	✅ No changes detected	-	Sep 18, 2025, 4:38 PM
v2-vercel (Inspect)	👍 Changes approved	2 changed	Sep 18, 2025, 4:36 PM