deps: Update nix crate to latest

[bryantbiggs]

• Update nix crate to latest
  • One of the major changes between 0.26 -> 0.27 is that all features are turned off by default and users need to opt into the features they wish to use

Closes #184

[bryantbiggs]

after updating, this was throwing the following error:

error[E0277]: the trait bound `i32: std::os::fd::AsFd` is not satisfied
    --> crates/runc-shim/src/common.rs:209:15
     |
209  |     tcgetattr(fds[0])?;
     |     --------- ^^^^^^ the trait `std::os::fd::AsFd` is not implemented for `i32`
     |     |
     |     required by a bound introduced by this call
     |

Looking into the docs, it looks like the current implementation is a no-op since tcsetattr() is never called on the structure https://github.com/nix-rust/nix/blob/996db47d542ae20f09eb344b9fcb88c40ae38e3d/src/sys/termios.rs#L1156-L1158

[bryantbiggs]

will need to think about this more