fix: wrong api version for network latest version (Azure#18992)

* fix: wrong api version for vmssNetworkInterface.json

* fix: wrong api version for vmssPublicIpAddress.json

Author: tadelesh

specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/vmssNetworkInterface.json

@@ -3,7 +3,7 @@
   "info": {
     "title": "NetworkManagementClient",
     "description": "The Microsoft Azure Network management API provides a RESTful set of web services that interact with Microsoft Azure Networks service to manage your network resources. The API has entities that capture the relationship between an end user and the Microsoft Azure Networks service.",
-    "version": "2018-10-01"
+    "version": "2021-08-01"
   },
   "host": "management.azure.com",
   "schemes": [

specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/vmssPublicIpAddress.json

@@ -3,7 +3,7 @@
   "info": {
     "title": "NetworkManagementClient",
     "description": "The Microsoft Azure Network management API provides a RESTful set of web services that interact with Microsoft Azure Networks service to manage your network resources. The API has entities that capture the relationship between an end user and the Microsoft Azure Networks service.",
-    "version": "2018-10-01"
+    "version": "2021-08-01"
   },
   "host": "management.azure.com",
   "schemes": [