Multiple version checkbox does nothing for RHEL/Fedora

[henderkes]

Summary

https://www.php.net/downloads.php?usage=web&os=linux&osvariant=linux-redhat&version=8.5&multiversion=Y

Details

It should probably switch to the namespaced version of @remicollet 's scl packages.

Additional context

No response

[shivammathur]

Fixed in #1714