chore(deps): update dependency svelte to ^5.20.4 [skip ci]

This MR contains the following updates:

Package	Type	Update	Change
svelte (source)	devDependencies	patch	^5.20.3 -> ^5.20.4

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Release Notes

sveltejs/svelte (svelte)

v5.20.4

Compare Source

Patch Changes

• fix: update types and inline docs for flushSync (#​15348)

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