OpenAPI Update (#661)

Update OpenAPI for 5787b5cbb9f6d06fb581cab918b1ee5204487cab

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

Author: stripe-openapi[bot]

embedded/openapi/spec3.beta.sdk.json

@@ -30022,6 +30022,12 @@
             "maxLength": 5000,
             "type": "string"
           },
+          "invoice": {
+            "description": "The ID of the invoice that contains this line item.",
+            "maxLength": 5000,
+            "nullable": true,
+            "type": "string"
+          },
           "invoice_item": {
             "anyOf": [
               {
@@ -30207,6 +30213,7 @@
           "discountable",
           "discounts",
           "id",
+          "invoice",
           "livemode",
           "metadata",
           "object",

embedded/openapi/spec3.json

@@ -20206,6 +20206,12 @@
             "maxLength": 5000,
             "type": "string"
           },
+          "invoice": {
+            "description": "The ID of the invoice that contains this line item.",
+            "maxLength": 5000,
+            "nullable": true,
+            "type": "string"
+          },
           "invoice_item": {
             "anyOf": [
               {