fix: remove remaining Sapper stuff (#12875)

* remove sapper bindings

* changeset

Author: fcrozatier

.changeset/happy-planets-rest.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: remove sapper bindings

packages/svelte/elements.d.ts

@@ -841,10 +841,6 @@ export interface HTMLAnchorAttributes extends HTMLAttributes<HTMLAnchorElement>
 	target?: HTMLAttributeAnchorTarget | undefined | null;
 	type?: string | undefined | null;
 	referrerpolicy?: ReferrerPolicy | undefined | null;
-
-	// Sapper
-	'sapper:noscroll'?: true | undefined | null;
-	'sapper:prefetch'?: true | undefined | null;
 }
 
 export interface HTMLAudioAttributes extends HTMLMediaAttributes<HTMLAudioElement> {}