chore: remove svelte-migrate changeset

[manuel3108]

See #1181
Since we will deprecate svelte-migrate there is no need to do a pre-release for that. So remove it temporarily.

[pkg-svelte-dev]

Install the latest version of sv from fa87241:

pnpm add https://pkg.svelte.dev/sv/c/fa872417a5dc9c13bd60a8ae4ec4e9183bd47496

Open in pkg.svelte.dev: https://pkg.svelte.dev/repos/cli/pr/1182

[changeset-bot]

⚠️ No Changeset found

Latest commit: fa87241

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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