chore: upgrade to react@19 (#9182)

packages/excalidraw/tests/elementLocking.test.tsx

@@ -1,7 +1,6 @@
 import React from "react";
-import ReactDOM from "react-dom";
 import { Excalidraw } from "../index";
-import { render } from "../tests/test-utils";
+import { render, unmountComponent } from "../tests/test-utils";
 import { Keyboard, Pointer, UI } from "../tests/helpers/ui";
 import { KEYS } from "../keys";
 import { API } from "../tests/helpers/api";
@@ -9,7 +8,7 @@ import { actionSelectAll } from "../actions";
 import { t } from "../i18n";
 import { mutateElement } from "../element/mutateElement";
 
-ReactDOM.unmountComponentAtNode(document.getElementById("root")!);
+unmountComponent();
 
 const mouse = new Pointer("mouse");
 const h = window.h;