Fix ToastContext test flake (#34045)

* Fix ToastContext test flake

* remove import

packages/shared-components/src/core/utils/ToastContext.test.tsx

@@ -7,7 +7,7 @@ Please see LICENSE files in the repository root for full details.
 */
 
 import { describe, it, expect, vitest } from "vitest";
-import { render, waitFor } from "@testing-library/react";
+import { render } from "@testing-library/react";
 import { Toast } from "@vector-im/compound-web";
 import React, { type JSX } from "react";
 
@@ -61,8 +61,6 @@ describe("useToastContext", () => {
                 <HappyComponent />
             </ToastContext>,
         );
-        await waitFor(() => {
-            expect(getByText("Toast!")).toBeInViewport();
-        });
+        expect(getByText("Toast!")).toBeVisible();
     });
 });