fix: Reverts endpoint variable change from e95cde8 (#240)

fix: reverts endpoint variable change from e95cde8

main.tf

@@ -73,7 +73,7 @@ resource "aws_sns_topic_subscription" "sns_notify_slack" {
 
   topic_arn           = local.sns_topic_arn
   protocol            = "lambda"
-  endpoint            = module.lambda.lambda_function_qualified_arn
+  endpoint            = module.lambda.lambda_function_arn
   filter_policy       = var.subscription_filter_policy
   filter_policy_scope = var.subscription_filter_policy_scope
 }