chore: don't import from svelte/internal (#10172)

Author: dummdidumm

.changeset/plenty-pigs-build.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+fix: don't import types from `svelte/internal`

packages/kit/src/types/internal.d.ts

@@ -1,4 +1,4 @@
-import { SvelteComponent } from 'svelte/internal';
+import { SvelteComponent } from 'svelte';
 import {
 Config,
 ServerLoad,