Fix exports in gitbook/expr package.json after removing src

[spastorelli]

Remove src folder from files in #3639 but missed updating exports

[changeset-bot]

🦋 Changeset detected

Latest commit: 3aafdc1

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

This PR includes changesets to release 3 packages

Name	Type
@gitbook/expr	Minor
@gitbook/react-openapi	Patch
gitbook	Patch

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[github-actions]

Summary of the deployments:

Version	URL	Status
Vercel	https://gitbook-v2-7w2sdd1k0-gitbook.vercel.app	✅
Cloudflare	https://0efb752e-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	2v	2c
GitBook	https://gitbook-v2-7w2sdd1k0-gitbook.vercel.app/url/gitbook.com/docs	https://0efb752e-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://gitbook-v2-7w2sdd1k0-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://0efb752e-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.gitbook.io/test-gitbook-open

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Build	Status	Details	Updated (UTC)
customers-v2 (Inspect)	👍 Changes approved	4 changed	Sep 12, 2025, 2:11 PM
v2-cloudflare (Inspect)	👍 Changes approved	2 changed	Sep 12, 2025, 2:16 PM
v2-vercel (Inspect)	👍 Changes approved	1 changed	Sep 12, 2025, 2:13 PM