Lint PHP code psr-12, add GH action

app/Notifications/Subscription/FailedPaymentNotification.php

@@ -30,7 +30,7 @@ class FailedPaymentNotification extends Notification implements ShouldQueue
      */
     public function toMail($notifiable)
     {
-        return (new MailMessage)
+        return (new MailMessage())
             ->subject('Your Payment Failed')
             ->greeting(__('We tried to charge your card for your OpenForm subscription but the payment but did not work.'))
             ->line(__('Please go to OpenForm, click on your name on the top right corner, and click on "Billing".