Behat: Drop `container-interop/container-interop` dependency

[mdrost]

As container-interop/container-interop is going to be abandoned I encourage you to drop that dependency and rely only on psr/container.

[Taluu]

Would be a BC Break (but imo would be an acceptable one)

[dimacros]

The package is deprecated. You must remove the dependency.

[danepowell]

To be clear, apart from the stability and security concerns related to relying on deprecated packages, all users of Behat are now getting scary yellow deprecation warnings like this from Composer:

Package container-interop/container-interop is abandoned, you should avoid using it. Use psr/container instead.

[pamil]

Fixed by #1281.