rust: update all dependencies
We do this periodically to say up to date.
No major versions were crossed this time per se, but the `rand` is still in v0,
and their 0.7x series broke three things:
- Some distribution-related elements were moved to a separate crate,
flashing a deprecation warning
- The `LogNormal::new` associated function now returns a `Result`
- Certain RNGs were updated to sample a `u32` instead of `usize` when their
upper-bound is less than `u32::MAX` for better portability, which changed
the output for 2 tests.
Moreover, the recent use of the `regex` crate for ignore mechanisms prompted
some benchmarking that revealed that `regex` was slower at compiling big regex
than `Re2`. The author of `regex` was very quick to discover an optimization
that yielded a 30% improvement. It's still slower than `Re2` in that regard, but
less so in the 1.3.6 release.
Differential Revision: https://phab.mercurial-scm.org/D8320
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