fix: convert undefined to null in an array

[m-shaka]

Hi. JSON.parse(JSON.stringify({a: ["foo", undefined]})) is {a: ["foo", null]}, so Jsonfify<(string | undefined)[]> should be (string | null)[]

• Docs
• Tests

Testing Strategy: typecheck test

[changeset-bot]

🦋 Changeset detected

Latest commit: 5531964

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

This PR includes changesets to release 16 packages

Name	Type
remix	Patch
@remix-run/serve	Patch
@remix-run/server-runtime	Patch
@remix-run/dev	Patch
@remix-run/cloudflare	Patch
@remix-run/deno	Patch
@remix-run/node	Patch
@remix-run/react	Patch
@remix-run/testing	Patch
@remix-run/cloudflare-pages	Patch
@remix-run/cloudflare-workers	Patch
@remix-run/architect	Patch
@remix-run/express	Patch
create-remix	Patch
@remix-run/css-bundle	Patch
@remix-run/eslint-config	Patch

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