Bump env_logger from 0.8.3 to 0.9.0 (#9538)

Bumps [env_logger](https://github.com/env-logger-rs/env_logger) from 0.8.3 to 0.9.0.
- [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](https://github.com/env-logger-rs/env_logger/compare/v0.8.3...v0.9.0)

---
updated-dependencies:
- dependency-name: env_logger
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

substrate/frame/merkle-mountain-range/Cargo.toml

@@ -27,7 +27,7 @@ frame-system = { version = "4.0.0-dev", default-features = false, path = "../sys
 pallet-mmr-primitives = { version = "4.0.0-dev", default-features = false, path = "./primitives" }
 
 [dev-dependencies]
-env_logger = "0.8"
+env_logger = "0.9"
 hex-literal = "0.3"
 
 [features]