[ReleasePR eventgrid] Azure Event Grid 2022-06-15 API version support (#2420)

Create to sync Azure/azure-rest-api-specs#19386
[ReCreate this PR](https://github.com/azure-resource-manager-schemas/compare/main...azure-sdk:sdkAuto/eventgrid?expand=1)

Author: msftbot[bot]

schemas/2018-05-01/subscriptionDeploymentTemplate.json

@@ -857,6 +857,9 @@
             {
               "$ref": "https://schema.management.azure.com/schemas/2021-12-01/Microsoft.EventGrid.json#/unknown_resourceDefinitions/eventSubscriptions"
             },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/2022-06-15/Microsoft.EventGrid.json#/unknown_resourceDefinitions/eventSubscriptions"
+            },
             {
               "$ref": "https://schema.management.azure.com/schemas/2021-07-01/Microsoft.Features.json#/subscription_resourceDefinitions/featureProviders_subscriptionFeatureRegistrations"
             },