Fix OpenAI deployment 'InsufficientQuota' error

I got a quota error that it seems Carey did not. I reduces the template to what my Azure Subscription allows me to provision. I'm assuming, depending on peoples subs, they might not have the higher quota either.

Author: crpietschmann

Labs/deploy/azuredeploy.bicep

@@ -87,7 +87,7 @@ var openAiSettings = {
     }
     sku: {
       name: 'Standard'
-      capacity: 150     
+      capacity: 120     
     }
   }
 }