Update generated code

[stripe-openapi]

Codegen for openapi v1268.

Changelog

• Add support for new resources Billing.CreditBalanceSummary, Billing.CreditBalanceTransaction, Billing.CreditGrant, and Margin
• Add support for retrieve method on resource CreditBalanceSummary
• Add support for list and retrieve methods on resource CreditBalanceTransaction
• Add support for create, expire, list, retrieve, update, and void_grant methods on resource CreditGrant
• Add support for usage_threshold on Billing.AlertCreateParams and Billing.Alert
• Remove support for filter and usage_threshold_config on Billing.AlertCreateParams and Billing.Alert
• Change BillingPortal.ConfigurationCreateParams.features.subscription_update.default_allowed_updates and BillingPortal.ConfigurationCreateParams.features.subscription_update.products to be optional
• Add support for pretax_credit_amounts on CreditNote
• Add support for total_pretax_credit_amounts on Invoice
• Add support for custom_unit_amount on ProductCreateParams.default_price_data
• Add support for allow_redisplay on Terminal.ReaderProcessPaymentIntentParams.process_config and Terminal.ReaderProcessSetupIntentParams
• Remove support for customer_consent_collected on Terminal.ReaderProcessSetupIntentParams
• Add support for new value international_transaction on enum Treasury.ReceivedCredit.failure_code
• Add support for new value 2024-09-30.acacia on enum WebhookEndpointCreateParams.api_version