Bump regex from 1.5.5 to 1.5.6

Bumps [regex](https://github.com/rust-lang/regex) from 1.5.5 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](rust-lang/regex@1.5.5...1.5.6)

---
updated-dependencies:
- dependency-name: regex
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Cargo.toml

@@ -45,7 +45,7 @@ serde_json = "1.0.81"
 tempfile = "3.3.0"
 url = { version = "2.2.2", features = ["serde"] }
 impl-serde = "0.3.2"
-regex = "1.5.5"
+regex = "1.5.6"
 
 # dependencies for extrinsics (deploying and calling a contract)
 async-std = { version = "1.11.0", features = ["attributes", "tokio1"] }
@@ -73,14 +73,14 @@ walkdir = "2.3.2"
 substrate-build-script-utils = "3.0.0"
 current_platform = "0.2.0"
 which = "4.2.5"
-regex = "1.5.5"
+regex = "1.5.6"
 
 [dev-dependencies]
 assert_cmd = "2.0.4"
 assert_matches = "1.5.0"
 pretty_assertions = "1.2.1"
 wabt = "0.10.0"
-regex = "1.5.5"
+regex = "1.5.6"
 predicates = "2.1.1"
 
 ink_primitives = "3"