Remove bad NLB attribute

Author: farski

spire/templates/apps/exchange.yml

@@ -1876,8 +1876,6 @@ Resources:
       IpAddressType: ipv4
       LoadBalancerAttributes:
         # https://docs.aws.amazon.com/elasticloadbalancing/latest/network/load-balancer-access-logs.html
-        - Key: idle_timeout.timeout_seconds
-          Value: "150"
         - Key: access_logs.s3.enabled
           Value: "true"
         - Key: access_logs.s3.bucket