Update generated code

[stripe-openapi]

Codegen for openapi v1019.

Changelog

• Add support for update test helper method on resources Treasury.OutboundPayment and Treasury.OutboundTransfer
• Add support for allow_redisplay on ConfirmationToken.payment_method_preview and PaymentMethod
• Add support for new values treasury.outbound_payment.tracking_details_updated and treasury.outbound_transfer.tracking_details_updated on enum Event.type
• Add support for preview_mode on InvoiceCreatePreviewParams, InvoiceUpcomingLinesParams, and InvoiceUpcomingParams
• Add support for pending_invoice_items_behavior on SubscriptionCreateParams
• Add support for tracking_details on Treasury.OutboundPayment and Treasury.OutboundTransfer
• Add support for new values treasury.outbound_payment.tracking_details_updated and treasury.outbound_transfer.tracking_details_updated on enums WebhookEndpointCreateParams.enabled_events[] and WebhookEndpointUpdateParams.enabled_events[]