Bump MSRV to match clap dependency

[rukai]

Since clap 4.4 bumped its MSRV to 1.70 inferno no longer builds on 1.64 and needs minimum 1.70
This PR:

• bumps inferno's MSRV to 1.70
• makes use of a new stdlib API in 1.70 to drop the is-terminal and rustix dependencies.
  • This was also cargo's motivation for bumping MSRV which is how I noticed we could do the same here.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (5d88bc3) 91.01% compared to head (8af0614) 91.01%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #301   +/-   ##
=======================================
  Coverage   91.01%   91.01%           
=======================================
  Files          19       19           
  Lines        4385     4385           
=======================================
  Hits         3991     3991           
  Misses        394      394           

Files Changed	Coverage Δ
src/collapse/mod.rs	96.96% <ø> (ø)

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[jonhoo]

Thanks! While I appreciate the PR, I don't think I want to bump inferno's MSRV to 1.70 yet — it is too new for the time being. And I don't think dropping the is-terminal dependency is that valuable in reality. The fact that clap 4.4 no longer supports 1.64 doesn't actually preclude anyone from building inferno with 1.64, as long as they come up with the right lockfile (which, while annoying, is at least possible). If we land these changes, then users of inferno have to use a newer Rust, or pin an older version of inferno.

I haven't formally set an MSRV policy for this crate, but in general I'd be looking at 12-18 months probably.

[rukai]

Understandable, I'll mark this as draft so it's around when it's needed.