Cloudflare: fix image resizing

[SamyPesse]

It currently sometimes fails with:

Error in routingHandler TypeError: Can't modify immutable headers.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 1213a0e

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[github-actions]

Summary of the deployments:

Version 1

Version	URL	Status
Latest commit	https://67ca4079.gitbook-open.pages.dev	✅
PR	https://pr3143.gitbook-open.pages.dev	✅

Version 2

Version	URL	Status
Vercel	https://gitbook-v2-gepo5olq3-gitbook.vercel.app	✅
Cloudflare	https://44a44cdc-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	v1	2v	2c
GitBook	https://67ca4079.gitbook-open.pages.dev/docs.gitbook.com	https://gitbook-v2-gepo5olq3-gitbook.vercel.app/url/docs.gitbook.com	https://44a44cdc-gitbook-open-v2-preview.gitbook.workers.dev/url/docs.gitbook.com
E2E	https://67ca4079.gitbook-open.pages.dev/gitbook.gitbook.io/test-gitbook-open	https://gitbook-v2-gepo5olq3-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://44a44cdc-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.gitbook.io/test-gitbook-open

[argos-ci]

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Build	Status	Details	Updated (UTC)
customers-v1 (Inspect)	👍 Changes approved	1 changed	Apr 11, 2025, 2:31 PM
customers-v2 (Inspect)	👍 Changes approved	137 changed, 1 failure	Apr 11, 2025, 2:34 PM
default (Inspect)	⚠️ Changes detected (Review)	1 changed, 12 removed, 5 failures	Apr 11, 2025, 2:35 PM
v2-cloudflare (Inspect)	🔘 Orphan build	648 added, 1 failure	Apr 11, 2025, 2:37 PM
v2-vercel (Inspect)	✅ No changes detected	-	Apr 11, 2025, 2:38 PM