Update generated code (#2086)

Update generated code for v1020

Co-authored-by: Stripe OpenAPI <105521251+stripe-openapi[bot]@users.noreply.github.com>

OPENAPI_VERSION

@@ -1 +1 @@
-v1019
+v1020

types/SubscriptionsResource.d.ts

@@ -157,11 +157,6 @@ declare module 'stripe' {
         SubscriptionCreateParams.PendingInvoiceItemInterval
       >;
 
-      /**
-       * How to handle a customer's pending invoice items if an invoice will be generated. Defaults to `include` if the parameter is omitted.
-       */
-      pending_invoice_items_behavior?: SubscriptionCreateParams.PendingInvoiceItemsBehavior;
-
       /**
        * The ID of a promotion code to apply to this subscription. A promotion code applied to a subscription will only affect invoices created for that particular subscription. This field has been deprecated and will be removed in a future API version. Use `discounts` instead.
        */
@@ -802,8 +797,6 @@ declare module 'stripe' {
         type Interval = 'day' | 'month' | 'week' | 'year';
       }
 
-      type PendingInvoiceItemsBehavior = 'exclude' | 'include';
-
       type ProrationBehavior = 'always_invoice' | 'create_prorations' | 'none';
 
       interface TransferData {