Sometimes, CloudLinux will release packages to their testing repositories before releasing them to the stable repositories. If you need a package that has not been released to stable, this is how you would install the package.
It's not advisable to enable the repositories globally on a production server. If the packages are needed, Yum has the "enablerepo" flag that enables the repository only for the command being run.
yum update $PACKAGENAME --enablerepo=cloudlinux-updates-testing
$PACKAGENAME is the name of the package you are updating.