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 Get method on resource CreditBalanceSummary
• Add support for Get and List methods on resource CreditBalanceTransaction
• Add support for Create, Expire, Get, List, Update, and VoidGrant methods on resource CreditGrant
• Add support for UsageThreshold on Billing.AlertCreateOptions and BillingAlert
• Remove support for Filter and UsageThresholdConfig on Billing.AlertCreateOptions and BillingAlert
• Add support for PretaxCreditAmounts on CreditNote
• Add support for TotalPretaxCreditAmounts on Invoice
• Add support for CustomUnitAmount on ProductDefaultPriceDataOptions
• Add support for AllowRedisplay on Terminal.ReaderProcessSetupIntentOptions and TerminalReaderProcessConfigOptions
• Remove support for CustomerConsentCollected on Terminal.ReaderProcessSetupIntentOptions