Update generated code for beta

[stripe-openapi]

Codegen for openapi v1719.

Changelog

• Add support for billing_mode on Checkout::Session::CreateParams::SubscriptionDatum, Invoice::CreatePreviewParams::ScheduleDetail, Invoice::CreatePreviewParams::SubscriptionDetail, Quote::CreateParams::SubscriptionDatum, Quote::SubscriptionDatum, QuotePreviewSubscriptionSchedule, Subscription::CreateParams, SubscriptionSchedule::CreateParams, SubscriptionSchedule, and Subscription
• Change Checkout::Session::AutomaticTax.provider, Invoice::AutomaticTax.provider, Quote::AutomaticTax.provider, and QuotePreviewInvoice::AutomaticTax.provider to be required
• Add support for account_number on ConfirmationToken::PaymentMethodPreview::AcssDebit and PaymentMethod::AcssDebit