[Release] 5.16.0 (#1971)

# Changes since last release

## Changed
    
- Add support for distinguishing between regular and native redirects to
improve handling of failed native redirect
   flows.
- For [native 3D Secure
2](https://docs.adyen.com/online-payments/3d-secure/native-3ds2/?platform=iOS&integration=Drop-in&version=5.0.0+and+later),
when a shopper cancels the payment during the payment flow,
the`didProvide(...`) delegate method is now triggered. What this means
for your integration depends on whether you already make a
`/payments/details` call to handle 3D Secure 2 errors:
    - If yes, you do not need to make any changes to your integration.
- If not, update your integration to make a `/payments/details` request
to get the details of the canceled transaction.

Adyen.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name = 'Adyen'
-  s.version = '5.15.0'
+  s.version = '5.16.0'
   s.summary = "Adyen Components for iOS"
   s.description = <<-DESC
     Adyen Components for iOS allows you to accept in-app payments by providing you with the building blocks you need to create a checkout experience.