Update dependency @sveltejs/kit to v2.5.20

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@sveltejs/kit (source)	2.5.18 -> 2.5.20

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Release Notes

sveltejs/kit (@​sveltejs/kit)

### [`v2.5.20`](https://togithub.com/sveltejs/kit/blob/HEAD/packages/kit/CHANGELOG.md#2520) [Compare Source](https://togithub.com/sveltejs/kit/compare/@sveltejs/kit@2.5.19...@sveltejs/kit@2.5.20) ##### Patch Changes - fix: set revalidate cache header on 404'd static assets ([#​12530](https://togithub.com/sveltejs/kit/pull/12530)) ### [`v2.5.19`](https://togithub.com/sveltejs/kit/blob/HEAD/packages/kit/CHANGELOG.md#2519) [Compare Source](https://togithub.com/sveltejs/kit/compare/@sveltejs/kit@2.5.18...@sveltejs/kit@2.5.19) ##### Patch Changes - fix: Svelte 5 - ignore `binding_non_reactive` warning in generated root component (you also need to update to `svelte@5.0.0-next.204`) ([#​12524](https://togithub.com/sveltejs/kit/pull/12524))

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