runc: Remove procps from wrapper

This reduces `runc` output closure size, particularly when not part of a
NixOS configuration.

`procps` was added in 50e24b8e0aed6, with the commit message indicating
the purpose of adding `systemctl` and `busctl`, both of which are
provided by `systemd` and not `procps`.

Presumably `procps` was added to make `runc ps` work regardless of the
environment, but this incurs a significant cost in terms of closure size,
especially when `runc` is packaged into something other than a NixOS
system, such as a dev shell or a package that does not use `runc ps`.

The alternative for improving the closure size would be to trim `procps`
itself. Currently it has a `systemd` dependency that's a significant cost.
However, removing that would also change `ps` and therefore `runc ps`
behavior. Furthermore, it would put two `procps` variants into the closure
of NixOS systems, when installed there.

Considering the above and the fact that the best `ps` is already present on
NixOS and most systems, I consider it the best solution not to bundle it
with `runc`, and take it from the environment instead.

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