Improves generic types on the skeleton (#5740)

app/Http/Kernel.php

@@ -11,7 +11,7 @@ class Kernel extends HttpKernel
      *
      * These middleware are run during every request to your application.
      *
-     * @var string[]
+     * @var array<int, class-string|string>
      */
     protected $middleware = [
         // \App\Http\Middleware\TrustHosts::class,
@@ -26,7 +26,7 @@ class Kernel extends HttpKernel
     /**
      * The application's route middleware groups.
      *
-     * @var array<string, string[]>
+     * @var array<string, array<int, class-string|string>>
      */
     protected $middlewareGroups = [
         'web' => [
@@ -51,7 +51,7 @@ class Kernel extends HttpKernel
      *
      * These middleware may be assigned to groups or used individually.
      *
-     * @var array<string, string>
+     * @var array<string, class-string|string>
      */
     protected $routeMiddleware = [
         'auth' => \App\Http\Middleware\Authenticate::class,