[ReleasePR consumption] [Hub Generated] Review request for Microsoft.Consumption to add version stable/2021-10-01 (#1944)

Create to sync Azure/azure-rest-api-specs#15958
[ReCreate this PR](https://github.com/azure-resource-manager-schemas/compare/main...AzureSDKAutomation:sdkAuto/consumption?expand=1)

Author: msftbot[bot]

schemas/2018-05-01/subscriptionDeploymentTemplate.json

@@ -770,6 +770,9 @@
             {
               "$ref": "https://schema.management.azure.com/schemas/2021-05-01/Microsoft.Consumption.json#/unknown_resourceDefinitions/budgets"
             },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/2021-10-01/Microsoft.Consumption.json#/unknown_resourceDefinitions/budgets"
+            },
             {
               "$ref": "https://schema.management.azure.com/schemas/2020-02-01-preview/Microsoft.Datadog.json#/subscription_resourceDefinitions/agreements"
             },