fix: allow `{@html await ...}` on the server

.changeset/long-spies-hope.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: allow `{@html await ...}` on the server

packages/svelte/src/compiler/phases/3-transform/server/visitors/HtmlTag.js

@@ -9,5 +9,10 @@ import * as b from '#compiler/builders';
  */
 export function HtmlTag(node, context) {
 	const expression = /** @type {Expression} */ (context.visit(node.expression));
-	context.state.template.push(b.call('$.html', expression));
+	const call = b.call('$.html', expression);
+	context.state.template.push(
+		node.metadata.expression.has_await
+			? b.stmt(b.call('$$renderer.push', b.thunk(call, true)))
+			: call
+	);
 }

packages/svelte/tests/server-side-rendering/samples/async-html-tag/_expected.html

@@ -0,0 +1 @@
+<div>this should work</div>

packages/svelte/tests/server-side-rendering/samples/async-html-tag/main.svelte

@@ -0,0 +1 @@
+<div>{@html await 'this should work'}</div>