Could you allow Symfony Process 6.x as well?

[ampaze]

Something like

"symfony/process": "^4.1|^5.0|^6.0"

[willemstuursma]

Hi @ampaze. Pull requests are accepted. I think the usage of the Process component changed between Symfony versions.

It is fine to drop support for Symfony 4.4.

[drealecs]

Fixed in #26.
Also 7.x support added in #38.