update peerDependency for prettier 3.x

[delight]

• adjust peerDependency to solve the unmet peer dependency warning

---

 WARN  Issues with peer dependencies found . └─┬ prettier-plugin-svelte 2.10.1 └── ✕ unmet peer prettier@"^1.16.4 || ^2.0.0": found 3.0.0

[Conduitry]

This plugin does not yet work properly with Prettier v3, so we shouldn't update the peer dependency to indicate that it does.

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