in /scripts folder on every server you have script which will upgrade MySQL and phpMyAdmin.
At this moment "upgrade_mysql" script is too old and outdated because it checks for MYSQL 5.5 instead of MariaDB and phpMyAdmin 4.x
=======================================================
So, here is a manual command for upgrade to the latest phpMyAdmin:
Go to directory
cd /usr/local/cwpsrv/var/services
Make a backup of the old phpMyAdmin into the root directory and pma folder
mv pma /root/
Download the latest phpMyAdmin
wget https://www.phpmyadmin.net/downloads/phpMyAdmin-latest-all-languages.zip
Unzip the downloaded archive
unzip phpMyAdmin-latest-all-languages.zip
Remove the downloaded archive, it's important to remove it now!
rm -rf phpMyAdmin-latest-all-languages.zip
Rename the "phpMyAdmin" folder to "pma"
mv phpMyAdmin-* pma
Delete the included stock config file, it's important!
rm -rf pma/config.sample.inc.php
Copy the old CWP config file from the backup to the new phpMyAdmin
cp /root/pma/config.inc.php /usr/local/cwpsrv/var/services/pma/
Fix permissions on the files and folders
chown -R cwpsvc:cwpsvc pma
Tested and works fine.