Fixing additionalProperties to use {} instead of object (Azure#24396)

Author: moadus

specification/azurearcdata/resource-manager/Microsoft.AzureArcData/preview/2023-01-15-preview/sqlManagedInstances.json

@@ -255,9 +255,7 @@
           "$ref": "#/definitions/k8stransparentDataEncryption"
         }
       },
-      "additionalProperties": {
-        "type": "object"
-      }
+      "additionalProperties": {}
     },
     "K8sActiveDirectory": {
       "type": "object",
@@ -315,9 +313,7 @@
           "$ref": "#/definitions/K8sNetworkSettings"
         }
       },
-      "additionalProperties": {
-        "type": "object"
-      }
+      "additionalProperties": {}
     },
     "K8sNetworkSettings": {
       "type": "object",