如何在Yum上更新EC @ instance上的postgresql，我目前的版本是
psql (PostgreSQL) 9.3.20
我想将psql升级到9.3.22 操作系统详细信息
NAME="Amazon Linux AMI"
VERSION="2017.09"
ID="amzn"
ID_LIKE="rhel fedora"
VERSION_ID="2017.09"
PRETTY_NAME="Amazon Linux AMI 2017.09"
ANSI_COLOR="0;33"
CPE_NAME="cpe:/o:amazon:linux:2017.09:ga"
HOME_URL="http://aws.amazon.com/amazon-linux-ami/"
Amazon Linux AMI release 2017.09