rust-dependencies: update `regex` to 1.3.9

Version `1.3.8` introduces support for empty alternations, which makes
previously disallowed patterns usable in `regex`.

From a user's perspective, this means that glob patterns like `*.py{,c}` will
no longer generate an "invalid" regex and will use the Rust path.

`1.3.9` is a bugfix release, might as well update to the latest one.

Differential Revision: https://phab.mercurial-scm.org/D8593

rust/Cargo.lock

@@ -1,727 +1,727
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rust/hg-core/Cargo.toml

@@ -1,40 +1,40
 [package]
 name = "hg-core"
 version = "0.1.0"
 authors = ["Georges Racinet <[e-mail]>"]
 description = "Mercurial pure Rust core library, with no assumption on Python bindings (FFI)"
 edition = "2018"
 build = "build.rs"
 
 [lib]
 name = "hg"
 
 [dependencies]
 byteorder = "1.3.4"
 hex = "0.4.2"
 lazy_static = "1.4.0"
 libc = { version = "0.2.66", optional = true }
 memchr = "2.3.3"
 rand = "0.7.3"
 rand_pcg = "0.2.1"
 rand_distr = "0.2.2"
 rayon = "1.3.0"
-regex = "1.3.6"
+regex = "1.3.9"
 twox-hash = "1.5.0"
 same-file = "1.0.6"
 crossbeam = "0.7.3"
 micro-timer = "0.2.1"
 log = "0.4.8"
 
 [dev-dependencies]
 clap = "*"
 memmap = "0.7.0"
 pretty_assertions = "0.6.1"
 tempfile = "3.1.0"
 
 [build-dependencies]
 cc = { version = "1.0.48", optional = true }
 
 [features]
 default = []
 with-re2 = ["cc", "libc"]