[10.x] Uses PHP Native Type Declarations 🐘 (#6010)

* Adds basic typing around method's arguments and return types

* Adds missing `closure` type

* Adds typing on tests

* Fixes `RedirectIfAuthenticated`

* Fixes `Authenticate`

* Improves `RedirectIfAuthenticated` types

* Fixes user factory `unverified` return type

app/Http/Middleware/Authenticate.php

@@ -3,19 +3,15 @@
 namespace App\Http\Middleware;
 
 use Illuminate\Auth\Middleware\Authenticate as Middleware;
+use Illuminate\Http\Request;
 
 class Authenticate extends Middleware
 {
     /**
      * Get the path the user should be redirected to when they are not authenticated.
-     *
-     * @param  \Illuminate\Http\Request  $request
-     * @return string|null
      */
-    protected function redirectTo($request)
+    protected function redirectTo(Request $request): string|null
     {
-        if (! $request->expectsJson()) {
-            return route('login');
-        }
+        return $request->expectsJson() ? null : route('login');
     }
 }