Update generated code for beta

[stripe-openapi]

Codegen for openapi v1819 and proto spec 2025-06-30.preview.

Changelog

• Change type of CheckoutSessionSubscriptionDataOptions.BillingMode, InvoiceScheduleDetailsOptions.BillingMode, InvoiceSubscriptionDetailsOptions.BillingMode, Quote.SubscriptionData.BillingMode, QuoteSubscriptionDataOptions.BillingMode, SubscriptionCreateOptions.BillingMode, and SubscriptionScheduleCreateOptions.BillingMode from enum('classic'|'flexible') to billing_mode
• Add support for SubmissionMethod on Dispute.EvidenceDetails
• Add support for OnDemand and Subscriptions on OrderPaymentSettingsPaymentMethodOptionsKlarnaOptions
• Change type of Order.Payment.Settings.PaymentMethodOptions.Klarna.SetupFutureUsage and OrderPaymentSettingsPaymentMethodOptionsKlarnaOptions.SetupFutureUsage from literal('none') to enum('none'|'off_session'|'on_session')
• Add support for Crypto on PaymentAttemptRecord.PaymentMethodDetails and PaymentRecord.PaymentMethodDetails
• Change type of PaymentIntent.PaymentMethodOptions.Gopay.SetupFutureUsage and PaymentIntentPaymentMethodOptionsGopayOptions.SetupFutureUsage from literal('none') to enum('none'|'off_session')
• Change type of QuotePreviewSubscriptionSchedule.BillingMode, Subscription.BillingMode, and SubscriptionSchedule.BillingMode from enum('classic'|'flexible') to SubscriptionsResourceBillingMode
• Change type of SubscriptionMigrateOptions.BillingMode from literal('flexible') to billing_mode_migrate
• Remove support for BillingModeDetails on Subscription
• Add support for ProofOfAddress on V2.Core.Account.Identity.BusinessDetails.Documents and V2CoreAccountIdentityBusinessDetailsDocumentsOptions
• Add support for Metadata on V2.MoneyManagement.FinancialAccount
• Remove support for Description on V2.MoneyManagement.FinancialAccount
• Remove support for Attempts on V2.Payments.OffSessionPayment
• Change type of V2.Payments.OffSessionPayment.TransferData.Amount from integer to nullable(integer)
• Add support for FromAccount, OutboundPayment, and OutboundTransfer on V2.MoneyManagement.ReceivedCredit.BalanceTransfer
• Change type of V2.MoneyManagement.ReceivedCredit.BalanceTransfer.Type from literal('payout_v1') to enum('outbound_payment'|'outbound_transfer'|'payout_v1')