Update Composer deps

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

Since we adopted Composer in Symfony, we limit the Symfony Components deps for any Symfony Component to the current version of Symfony. That's very limited as for instance, any version of Yaml can be used as a dependency for any other Symfony Component. So, this PR changes the version constraints for dependencies to the largest range possible.

The idea is also to open the range even more when new versions of Symfony comes.