Update generated code

[stripe-openapi]

Codegen for openapi v1020.

Changelog

• Add support for Update test helper method on resources Treasury.OutboundPayment and Treasury.OutboundTransfer
• Add support for AllowRedisplay on ConfirmationTokenPaymentMethodPreview and PaymentMethod
• Change type of EntitlementsFeatureMetadataOptions from map(string: string) to emptyable(map(string: string))
• Add support for PreviewMode on InvoiceCreatePreviewOptions, InvoiceUpcomingLinesOptions, and InvoiceUpcomingOptions
• Add support for TrackingDetails on TreasuryOutboundPayment and TreasuryOutboundTransfer