Switch to ReactDOM.createRoot

The old `ReactDOM.render` function is deprecated in React 18.

See: https://reactjs.org/link/switch-to-createroot

src/index.tsx

@@ -1,15 +1,15 @@
 import { StrictMode } from "react";
-import ReactDOM from "react-dom";
+import { createRoot } from "react-dom/client";
 import { ChakraProvider } from "@chakra-ui/react";
 import * as wasm from "rustpad-wasm";
 import App from "./App";
 import "./index.css";
 
-ReactDOM.render(
+const root = createRoot(document.getElementById("root"));
+root.render(
   <StrictMode>
     <ChakraProvider>
       <App />
     </ChakraProvider>
-  </StrictMode>,
-  document.getElementById("root")
+  </StrictMode>
 );