[Glitch] Upgrade to React 18

Port 8d6aea3326 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/packs/admin.jsx

@@ -1,7 +1,7 @@
 import 'packs/public-path';
 import ready from 'flavours/glitch/ready';
 import React from 'react';
-import ReactDOM from 'react-dom';
+import { createRoot } from 'react-dom/client';
 
 ready(() => {
   [].forEach.call(document.querySelectorAll('[data-admin-component]'), element => {
@@ -10,11 +10,13 @@ ready(() => {
 
     import('flavours/glitch/containers/admin_component').then(({ default: AdminComponent }) => {
       return import('flavours/glitch/components/admin/' + componentName).then(({ default: Component }) => {
-        ReactDOM.render((
+        const root = createRoot(element);
+
+        root.render (
           <AdminComponent locale={locale}>
             <Component {...componentProps} />
-          </AdminComponent>
-        ), element);
+          </AdminComponent>,
+        );
       });
     }).catch(error => {
       console.error(error);