build(deps): Update env_logger requirement from 0.9 to 0.10 (#146)

Updates the requirements on [env_logger](https://github.com/rust-cli/env_logger) to permit the latest version.
- [Release notes](https://github.com/rust-cli/env_logger/releases)
- [Changelog](https://github.com/rust-cli/env_logger/blob/main/CHANGELOG.md)
- [Commits](rust-cli/env_logger@v0.9.0...v0.10.0)

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

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

test-harness/Cargo.toml

@@ -14,6 +14,6 @@ anyhow = "1"
 log = "0.4.17"
 
 [dev-dependencies]
-env_logger = "0.9"
+env_logger = "0.10"
 constrained-connection = "0.1"
 

yamux/Cargo.toml

@@ -21,7 +21,7 @@ static_assertions = "1"
 [dev-dependencies]
 anyhow = "1"
 criterion = "0.4"
-env_logger = "0.9"
+env_logger = "0.10"
 futures = "0.3.4"
 quickcheck = "1.0"
 tokio = { version = "1.0", features = ["net", "rt-multi-thread", "macros", "time"] }