fix: add fetchpriority to image attrs (#10390)

Fixes #8099

---------

Co-authored-by: Simon H <5968653+dummdidumm@users.noreply.github.com>

.changeset/made-this-up.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: add `fetchpriority` attribute type

packages/svelte/elements.d.ts

@@ -762,6 +762,7 @@ export interface HTMLImgAttributes extends HTMLAttributes<HTMLImageElement> {
 	alt?: string | undefined | null;
 	crossorigin?: 'anonymous' | 'use-credentials' | '' | undefined | null;
 	decoding?: 'async' | 'auto' | 'sync' | undefined | null;
+	fetchpriority?: 'auto' | 'high' | 'low' | undefined | null;
 	height?: number | string | undefined | null;
 	ismap?: boolean | undefined | null;
 	loading?: 'eager' | 'lazy' | undefined | null;