chore: update prettier-plugin-marko to 4.1

Formatting keeps the `async` keyword on shorthand methods; covered by a
format test through the extension.

Author: DylanPiercey

.changeset/prettier-plugin-marko-4-1.md

@@ -0,0 +1,6 @@
+---
+"@marko/language-server": patch
+"marko-vscode": patch
+---
+
+Update prettier-plugin-marko to 4.1, so formatting keeps the `async` keyword on shorthand methods.

packages/language-server/package.json

@@ -51,7 +51,7 @@
     "jsdom": "^29.1.1",
     "marko": "^5.39.33",
     "prettier": "^3.8.4",
-    "prettier-plugin-marko": "^4.0.10",
+    "prettier-plugin-marko": "^4.1.0",
     "relative-import-path": "^1.0.1",
     "typescript": "^6.0.3",
     "vscode-css-languageservice": "^6.3.10",

packages/vscode/src/__tests__/format.test.ts

@@ -31,6 +31,20 @@ describe("format", () => {
     of=those
 />
 
+`,
+    );
+  });
+
+  it("async shorthand method", async () => {
+    await snap.inline(
+      () => format("<button async onClick() { await save() }>go</button>"),
+      `
+<button async onClick() {
+    await save();
+}>
+    go
+</button>
+
 `,
     );
   });