chore(deps): update dependency svelte to ^5.20.0 [skip ci]

This MR contains the following updates:

Package	Type	Update	Change
svelte (source)	devDependencies	minor	^5.19.10 -> ^5.20.0

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Release Notes

sveltejs/svelte (svelte)

v5.20.0

Compare Source

Minor Changes

• feat: SSR-safe ID generation with $props.id() (#​15185)

Patch Changes

• fix: take private and public into account for constant_assignment of derived state (#​15276)

• fix: value/checked not correctly set using spread (#​15239)

• chore: tweak effect self invalidation logic, run transition dispatches without reactive context (#​15275)

• fix: use importNode to clone templates for Firefox (#​15272)

• fix: recurse into $derived for ownership validation (#​15166)

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