I'm supprised phpmyadmin requires a mysql version of 5.5 ... centos is using a stable securely backported version of mysql. I personally would be looking to make phpmyadmin work on the distro version of mysql rather than relying on external repos..
Alternatively look at installing MariaDB as a drop in replacement
This needs raising as a bug on the installers repo over on github ...
Alternatively look at installing MariaDB as a drop in replacement
This needs raising as a bug on the installers repo over on github ...