Update Symfony package versions to include 8.0

[tcoch]

While trying https://github.com/dunglas/symfony-docker for a new Symfony 8 project, I encountered this error :

Loading composer repositories with package information
Restricting packages listed in "symfony/symfony" to "8.0.*"
Updating dependencies
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Root composer.json requires runtime/frankenphp-symfony * -> satisfiable by runtime/frankenphp-symfony[0.1.0, 0.1.1, 0.2.0, 1.0.0].
    - runtime/frankenphp-symfony[0.1.0, ..., 0.1.1] require symfony/dependency-injection ^5.4 || ^6.0 -> found symfony/dependency-injection[v5.4.0, ..., v5.4.48, v6.0.0, ..., v6.4.30] but these were not loaded, likely because it conflicts with another require.
    - runtime/frankenphp-symfony[0.2.0, 1.0.0] require symfony/dependency-injection ^5.4 || ^6.0 || ^7.0 -> found symfony/dependency-injection[v5.4.0, ..., v5.4.48, v6.0.0, ..., v6.4.30, v7.0.0, ..., v7.4.2] but these were not loaded, likely because it conflicts with another require.

This PR aims to resolve that.

[qdequippe]

👋🏼 maybe this PR (and this lib) is not necessary anymore ?

Symfony 7.4 improves the integration with FrankenPHP worker mode. You no longer need to install the runtime/frankenphp-symfony package. Just upgrade to Symfony 7.4, which natively supports FrankenPHP worker mode out of the box.

https://symfony.com/blog/new-in-symfony-7-4-dx-improvements-part-2