Update generated code (#1336)

* Update generated code for v833

* Update generated code for v840

---------

Co-authored-by: Stripe OpenAPI <105521251+stripe-openapi[bot]@users.noreply.github.com>
Co-authored-by: pakrym-stripe <99349468+pakrym-stripe@users.noreply.github.com>

OPENAPI_VERSION

@@ -1 +1 @@
-v829
+v840

lib/stripe/resources/invoice_line_item.rb

@@ -3,9 +3,24 @@
 
 module Stripe
   class InvoiceLineItem < StripeObject
+    include Stripe::APIOperations::Save
+
     OBJECT_NAME = "line_item"
     def self.object_name
       "line_item"
     end
+
+    # Updates an invoice's line item. Some fields, such as tax_amounts, only live on the invoice line item,
+    # so they can only be updated through this endpoint. Other fields, such as amount, live on both the invoice
+    # item and the invoice line item, so updates on this endpoint will propagate to the invoice item as well.
+    # Updating an invoice's line item is only possible before the invoice is finalized.
+    def self.update(id, params = {}, opts = {})
+      request_stripe_object(
+        method: :post,
+        path: format("/v1/invoices/%<invoice>s/lines/%<id>s", { invoice: CGI.escape(invoice), id: CGI.escape(id) }),
+        params: params,
+        opts: opts
+      )
+    end
   end
 end