chore: enter pre-release mode for SvelteKit 3

[benmccann]

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[changeset-bot]

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Latest commit: 1640c68

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[dominikg]

you have to change the basebranch in changeset config https://github.com/sveltejs/vite-plugin-svelte/blob/6719e18b2d9fbb3f6554de7d5ffb75cf395a2ab4/.changeset/config.json#L10

[dominikg]

branch config in workflows has to be updated from main to version-3 as well

sveltejs/vite-plugin-svelte@6719e18

(sorry, just remembered)