Stripe Payment: Rollback stipe-php from 20.0.0 back to 19.4.1 to fix a isses with adding saved paymentss, Stripe updated their API in which we will update to a later date

plugins/stripe-php/lib/Stripe.php

@@ -64,7 +64,7 @@ class Stripe
     /** @var float Initial delay between retries, in seconds */
     private static $initialNetworkRetryDelay = 0.5;
 
-    const VERSION = '20.0.0';
+    const VERSION = '19.4.1';
 
     /**
      * @return string the API key used for requests