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

--- a/rust/hg-core/src/discovery.rs	Mon Mar 23 12:07:45 2020 +0100
+++ b/rust/hg-core/src/discovery.rs	Mon Mar 23 12:11:41 2020 +0100
@@ -597,12 +597,12 @@
 
     #[test]
     fn test_limit_sample_less_than_half() {
-        assert_eq!(full_disco().limit_sample((1..6).collect(), 2), vec![4, 2]);
+        assert_eq!(full_disco().limit_sample((1..6).collect(), 2), vec![2, 5]);
     }
 
     #[test]
     fn test_limit_sample_more_than_half() {
-        assert_eq!(full_disco().limit_sample((1..4).collect(), 2), vec![3, 2]);
+        assert_eq!(full_disco().limit_sample((1..4).collect(), 2), vec![1, 2]);
     }
 
     #[test]