Update generated code (#1921)

* Update generated code for v2026 and 2025-09-30.clover * Update generated code for v2026 and 2025-09-30.clover * Update generated code for v2026 and 2025-09-30.clover --------- Co-authored-by: Stripe OpenAPI <105521251+stripe-openapi[bot]@users.noreply.github.com>

Author: stripe-openapi[bot]

OPENAPI_VERSION

@@ -1 +1 @@
-v2025
+v2026

lib/Invoice.php

@@ -38,7 +38,7 @@
  *
  * Related guide: <a href="https://stripe.com/docs/billing/invoices/sending">Send invoices to customers</a>
  *
- * @property null|string $id Unique identifier for the object. For preview invoices created using the <a href="https://stripe.com/docs/api/invoices/create_preview">create preview</a> endpoint, this id will be prefixed with <code>upcoming_in</code>.
+ * @property string $id Unique identifier for the object. For preview invoices created using the <a href="https://stripe.com/docs/api/invoices/create_preview">create preview</a> endpoint, this id will be prefixed with <code>upcoming_in</code>.
  * @property string $object String representing the object's type. Objects of the same type share the same value.
  * @property null|string $account_country The country of the business associated with this invoice, most often the business creating the invoice.
  * @property null|string $account_name The public name of the business associated with this invoice, most often the business creating the invoice.