Update generated code

[stripe-openapi]

Codegen for openapi v596.

Changelog

• Add support for redirect_on_completion, return_url, and ui_mode on Checkout.SessionCreateParams and Checkout.Session
• Change Checkout.Session.custom_fields[].dropdown, Checkout.Session.custom_fields[].numeric, Checkout.Session.custom_fields[].text, Checkout.SessionCreateParams.success_url, PaymentLink.custom_fields[].dropdown, PaymentLink.custom_fields[].numeric, and PaymentLink.custom_fields[].text to be optional
• Add support for client_secret on Checkout.Session
• Change type of Checkout.Session.custom_fields[].dropdown from PaymentPagesCheckoutSessionCustomFieldsDropdown | null to PaymentPagesCheckoutSessionCustomFieldsDropdown
• Change type of Checkout.Session.custom_fields[].numeric and Checkout.Session.custom_fields[].text from PaymentPagesCheckoutSessionCustomFieldsNumeric | null to PaymentPagesCheckoutSessionCustomFieldsNumeric
• Add support for postal_code on Issuing.Authorization.verification_data
• Change type of PaymentLink.custom_fields[].dropdown from PaymentLinksResourceCustomFieldsDropdown | null to PaymentLinksResourceCustomFieldsDropdown
• Change type of PaymentLink.custom_fields[].numeric and PaymentLink.custom_fields[].text from PaymentLinksResourceCustomFieldsNumeric | null to PaymentLinksResourceCustomFieldsNumeric
• Add support for offline on Terminal.ConfigurationCreateParams, Terminal.ConfigurationUpdateParams, and Terminal.Configuration