Bump regex from 1.4.5 to 1.4.6 in /blacksmith (#530)

Bumps [regex](https://github.com/rust-lang/regex) from 1.4.5 to 1.4.6.
- [Release notes](https://github.com/rust-lang/regex/releases)
- [Changelog](https://github.com/rust-lang/regex/blob/master/CHANGELOG.md)
- [Commits](rust-lang/regex@1.4.5...1.4.6)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

blacksmith/Cargo.lock

@@ -10,7 +10,7 @@ publish = false
 [dependencies]
 env_logger = "0.8.3"
 log = "0.4.14"
-regex = "1.4.5"
+regex = "1.4.6"
 reqwest = { version = "0.11", features = ["blocking"] }
 serde = { version = "1.0.125", features = ["derive"] }
 serde_json = "1.0.64"