Remove network acl (#236)

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Author: LittleLittleCloud

infra/core/ai/cognitiveservices.bicep

@@ -18,9 +18,6 @@ resource account 'Microsoft.CognitiveServices/accounts@2023-05-01' = {
   properties: {
     customSubDomainName: customSubDomainName
     publicNetworkAccess: publicNetworkAccess
-    networkAcls: {
-      defaultAction: 'Allow'
-    }
   }
   sku: sku
 }