Bump regex from 1.5.3 to 1.5.4 in /blacksmith (#547)

Bumps [regex](https://github.com/rust-lang/regex) from 1.5.3 to 1.5.4.
- [Release notes](https://github.com/rust-lang/regex/releases)
- [Changelog](https://github.com/rust-lang/regex/blob/master/CHANGELOG.md)
- [Commits](rust-lang/regex@1.5.3...1.5.4)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

blacksmith/Cargo.lock

@@ -10,7 +10,7 @@ publish = false
 [dependencies]
 env_logger = "0.8.3"
 log = "0.4.14"
-regex = "1.5.3"
+regex = "1.5.4"
 reqwest = { version = "0.11", features = ["blocking"] }
 serde = { version = "1.0.130", features = ["derive"] }
 serde_json = "1.0.69"