Bump toml from 0.5.6 to 0.5.7 in /blacksmith

Bumps [toml](https://github.com/alexcrichton/toml-rs) from 0.5.6 to 0.5.7.
- [Release notes](https://github.com/alexcrichton/toml-rs/releases)
- [Commits](toml-rs/toml-rs@0.5.6...0.5.7)

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

Author: dependabot-preview[bot]

blacksmith/Cargo.lock

@@ -14,7 +14,7 @@ regex = "1.3.9"
 reqwest = { version = "0.10", features = ["blocking"] }
 serde = { version = "1.0.116", features = ["derive"] }
 serde_json = "1.0.58"
-toml = "0.5.3"
+toml = "0.5.7"
 
 [dependencies.clap]
 version = "2.33.3"