fix(ts) set ES2024 as our target for web

We depend on ES2024 features. For environments without full support,
webpack will add polyfills.

react/features/app/components/AbstractApp.ts

  * @abstract
  */
 export class AbstractApp<P extends IProps = IProps> extends BaseApp<P> {
-    /**
-     * The deferred for the initialization {{promise, resolve, reject}}.
-     */
-    _init: PromiseWithResolvers<any>;
-
     /**
      * Initializes the app.
      *

tsconfig.web.json

     "compilerOptions": {
         "allowSyntheticDefaultImports": true,
         "module": "es2020",
-        "target": "es2020",
+        "target": "es2024",
         "jsx": "react",
-        "lib": [ "ES2020", "ES2024.Promise", "DOM" ],
+        "lib": [ "ES2024", "DOM" ],
         "skipLibCheck": true,
         "moduleResolution": "Node",
         "strict": true,