Fix: add shop url in customers schema

Author: saimanoj

airbyte-integrations/connectors/source-shopify/source_shopify/schemas/customers.json

@@ -13,6 +13,9 @@
     "multipass_identifier": {
       "type": ["null", "string"]
     },
+    "shop_url":{
+      "type": ["null", "string"]
+    },
     "default_address": {
       "type": ["null", "object"],
       "properties": {