Replace deps kr/pty with creak/pty to fix crash on macOs

[bebsworthy]

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Attempted fix for 'Setctty set but Ctty not valid in child' when using ssh and pty:true on macOS.

The issue was discussed here https://github.com/creack/pty/issues/96; sampler was using an older fork kr/pty, the issue doesn't seem to be present with the latest creak/pty.

fix #110

[michaelcurry]

I thank you for doing this, as I was about do to same 😅 and then i stumbled across this

🤔 Is Sampler no longer maintained? Seems like this has been open for a while now....