Drop PHP 7.4, 8.0 and 8.1 support, ensure PHP 8.3 support

[a-r-m-i-n]

Because PHP 7.4 support is already over, this version does not need to get supported anymore. Same goes for PHP 8.0, which is about to end. Thinking about to raising the required PHP version to 8.2 and release all this with new major version 2.0.0.

Also, PHP 8.3 is out, so the automated tests should cover this case.

And, thanks to new PHP 8 features, some code refactorings should also get applied. And Symfony v7 components should also get supported.