Update env_logger requirement from 0.8.1 to 0.9.0 (#32)

Updates the requirements on [env_logger](https://github.com/env-logger-rs/env_logger) to permit the latest version.
- [Release notes](https://github.com/env-logger-rs/env_logger/releases)
- [Changelog](https://github.com/env-logger-rs/env_logger/blob/main/CHANGELOG.md)
- [Commits](rust-cli/env_logger@v0.8.1...v0.9.0)

---
updated-dependencies:
- dependency-name: env_logger
  dependency-type: direct:production
...

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Cargo.toml

@@ -44,5 +44,5 @@ libc = "0.2"
 
 [dev-dependencies]
 doc-comment = "0.3"
-env_logger = "0.8.1"
+env_logger = "0.9.0"
 tempfile = "3.1"