Deprecate the "basic-card" payment method from PaymentRequest API.
* Its usage is low and declining, underperforms other payment methods in time-to-checkout and completion rate and does not have improvement potential. * W3C's interest in it has waned. 6 participants supported the deprecation and no objection[1], and W3C has deprecated the spec[2]. No interop risk as Chrome is the only implementer. [1] https://lists.w3.org/Archives/Public/public-payments-wg/2021Aug/0038.html [2] https://github.com/w3c/payment-method-basic-card/pull/90/files