Bump env_logger from 0.7.1 to 0.8.1 in /blacksmith

Bumps [env_logger](https://github.com/env-logger-rs/env_logger) from 0.7.1 to 0.8.1.
- [Release notes](https://github.com/env-logger-rs/env_logger/releases)
- [Changelog](https://github.com/env-logger-rs/env_logger/blob/master/CHANGELOG.md)
- [Commits](rust-cli/env_logger@v0.7.1...v0.8.1)

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

Author: dependabot-preview[bot]

blacksmith/Cargo.lock

@@ -8,7 +8,7 @@ publish = false
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-env_logger = "0.7.1"
+env_logger = "0.8.1"
 log = "0.4.11"
 regex = "1.4.1"
 reqwest = { version = "0.10", features = ["blocking"] }