Fix test

Author: brophdawg11

packages/react-router-dom/__tests__/data-browser-router-test.tsx

@@ -4911,6 +4911,7 @@ function testDomRouter(
           ],
           {
             window: getWindow("/"),
+            hydrationData: { loaderData: { "0": null } },
           }
         );
         let { container } = render(<RouterProvider router={router} />);

packages/router/__tests__/router-test.ts

@@ -10799,6 +10799,7 @@ describe("a router", () => {
           routes: [{ id: "root", path: "/", loader: () => "LOADER" }],
           history: createMemoryHistory(),
           future: { v7_normalizeFormMethod: true },
+          hydrationData: { loaderData: { root: null } },
         }).initialize();
 
         let key = "key";