Bump serde from 1.0.125 to 1.0.126 in /blacksmith (#536)

Bumps [serde](https://github.com/serde-rs/serde) from 1.0.125 to 1.0.126.
- [Release notes](https://github.com/serde-rs/serde/releases)
- [Commits](serde-rs/serde@v1.0.125...v1.0.126)

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

Author: dependabot[bot]

blacksmith/Cargo.lock

@@ -12,7 +12,7 @@ env_logger = "0.8.3"
 log = "0.4.14"
 regex = "1.5.3"
 reqwest = { version = "0.11", features = ["blocking"] }
-serde = { version = "1.0.125", features = ["derive"] }
+serde = { version = "1.0.126", features = ["derive"] }
 serde_json = "1.0.64"
 toml = "0.5.8"