Add hint as a valid value for the popover attribute

As per:

https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/popover#value

https://html.spec.whatwg.org/multipage/popover.html#attr-popover

packages/svelte/elements.d.ts

@@ -771,7 +771,7 @@ export interface HTMLAttributes<T extends EventTarget> extends AriaAttributes, D
 	title?: string | undefined | null;
 	translate?: 'yes' | 'no' | '' | undefined | null;
 	inert?: boolean | undefined | null;
-	popover?: 'auto' | 'manual' | '' | undefined | null;
+	popover?: 'auto' | 'manual' | 'hint' | '' | undefined | null;
 	writingsuggestions?: Booleanish | undefined | null;
 
 	// Unknown