Bump regex from 1.3.9 to 1.5.6 in /benchmarks

Bumps [regex](https://github.com/rust-lang/regex) from 1.3.9 to 1.5.6.
- [Release notes](https://github.com/rust-lang/regex/releases)
- [Changelog](https://github.com/rust-lang/regex/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-lang/regex/compare/1.3.9...1.5.6)

---
updated-dependencies:
- dependency-name: regex
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

benchmarks/Cargo.lock

@@ -1,5 +1,7 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
 [[package]]
 name = "atty"
 version = "0.2.14"
@@ -95,6 +97,12 @@ version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b3a71ab494c0b5b860bdc8407ae08978052417070c2ced38573a9157ad75b8ac"
 
+[[package]]
+name = "cp437"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "891a48ae269a368d5e45e0b13ee401f90d3d400da92d881f7cb67bc9da711c14"
+
 [[package]]
 name = "criterion"
 version = "0.3.3"
@@ -397,9 +405,10 @@ dependencies = [
 
 [[package]]
 name = "phetch"
-version = "1.0.4-dev"
+version = "1.1.1-dev"
 dependencies = [
  "atty",
+ "cp437",
  "lazy_static",
  "libc",
  "native-tls",
@@ -540,9 +549,9 @@ dependencies = [
 
 [[package]]
 name = "regex"
-version = "1.3.9"
+version = "1.5.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9c3780fcf44b193bc4d09f36d2a3c87b251da4a046c87795a0d35f4f927ad8e6"
+checksum = "d83f127d94bdbcda4c8cc2e50f6f84f4b611f69c902699ca385a39c3a75f9ff1"
 dependencies = [
  "regex-syntax",
 ]
@@ -558,9 +567,9 @@ dependencies = [
 
 [[package]]
 name = "regex-syntax"
-version = "0.6.18"
+version = "0.6.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "26412eb97c6b088a6997e05f69403a802a92d520de2f8e63c2b65f9e0f47c4e8"
+checksum = "49b3de9ec5dc0a3417da371aab17d729997c15010e7fd24ff707773a33bddb64"
 
 [[package]]
 name = "remove_dir_all"