Update to smarty4

[davidcoutadeur]

Some time ago (see #773) we decided to remove smarty3 from direct dependencies, because

1/ it was broken on ubuntu (https://bugs.launchpad.net/ubuntu/+source/smarty3/+bug/1986916) and
2/ it was unavailable on some rh-like systems

I think it is interesting to now consider the upgrade to smarty4, for multiple reasons:

• smarty4 is released since 2021. It is now considered as the stable version. smarty3 is now only recommended for applications requiring PHP < 7.1
• smarty4 seems well-packaged on multiple systems (tested and working on debian 12)
• we could simplify installation process by simply enabling smarty4 as a requirement in rpm/deb packages

[coudot]

We also need to see if Smarty is a system dependency or a composer dependency

[davidcoutadeur]

We also need to see if Smarty is a system dependency or a composer dependency

smarty4 is a system dependency on debian.

@xavierba is working on a smarty4 package on rh-like systems

[davidcoutadeur]

NOTE: When (if) updating requirement to smarty4, we must also list the new version in deb package (replacement of smarty path in config files in debian/replace_cache_dirs + Depends: in control file) and in RPM package (replacement of smarty path in config files + requirement of smarty package)

[davidcoutadeur]

smarty4 is not available on debian 11 and debian 10.

We may require it with as a OR dependency: smarty4|smarty3 (with a preference for smarty4)

[coudot]

php-Smarty 4 not yet available on EPEL/Fedora, but as we don't require explicitely v3, it will use Smarty 4 as soon it is available.