Add Payment Request API 1.1

[Schweinepriester]

• Spec: https://www.w3.org/TR/payment-request-1.1/

• https://www.w3.org/blog/news/archives/9644

• (DE) https://www.heise.de/news/Bezahlen-im-Browser-W3C-legt-ersten-Entwurf-fuer-Payment-Request-API-1-1-vor-7190323.html

• Not the same as https://caniuse.com/payment-request, at least currently - they talk about that in https://www.w3.org/TR/payment-request-1.1/#sotd

  The W3C published Payment Request API 1.0 as a Proposed Recommendation in September 2021.

  …

  If Payment Request API 1.0 advances to Recommendation, the Editors will determine whether it would be preferable to fold these changes into an evolving 1.0 Recommendation, or to continue to nurture a 1.1 branch. At the current time, we do not need to make that decision.

[Jirina2181]

Super