Upgrade postgres to v11 #401

Job	Run time
fmt	10s
validate (envs/production)	13s
validate (envs/staging)	17s
validate (modules/api)	9s
validate (modules/cloudflare)	9s
validate (modules/dbdump)	9s
validate (modules/dbsetup)	12s
validate (modules/enmeshed)	8s
validate (modules/gcloud/cluster)	10s
validate (modules/gcloud/gcloud_dbdump_reader)	12s
validate (modules/gcloud/gcloud_dbdump_writer)	12s
validate (modules/gcloud/gcloud_mysql)	9s
validate (modules/gcloud/gcloud_postgres)	12s
validate (modules/hydra)	10s
validate (modules/ingress)	9s
validate (modules/ingress-nginx)	9s
validate (modules/kratos)	8s
validate (modules/redis)	8s
validate (modules/rocket-chat)	11s
validate (modules/tls-self-signed-cert)	14s
	3m 31s

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