Update generated code

[stripe-openapi[bot]]

Codegen for openapi v938.

Changelog

• Add support for new resources Entitlements.ActiveEntitlement and Entitlements.Feature
• Add support for all and retrieve methods on resource ActiveEntitlement
• Add support for all, create, retrieve, and update methods on resource Feature
• Add support for new value none on enum Account.type
• Add support for cancel, event_name, and type on Billing.MeterEventAdjustment