…orrect it

* dependencies.x86 was bumped to latest current version. x86 crate
  does not advertise an MSRV, but this was just broken on even our
  MSRV because the old x86 version was using a macro removed from
  rust, so bumping to latest seems fair.
* the calculation for the arbitrary impl of Layout was using a
  max_size that was too large and overflowing Layout. this has
  been fixed.
* test for arbitrary AllocError was referring to AllocErr which
  does not exist, this was fixed.
* NoneError has been removed from rust so it was subsequently
  removed from proptest. It was blocking compilation.
  evidence:
  rust-lang/rust#85614
* try_reserve is stable so removed from unstable features
* try_trait has been changed to try_trait_v2 so that was fixed
  in Cargo.toml.

…at_sampler

…also correct random grammar error