Update env_logger requirement from 0.8.2 to 0.9.0

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](https://github.com/env-logger-rs/env_logger/compare/v0.8.2...v0.9.0)

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

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

yaserde/Cargo.toml

@@ -17,7 +17,7 @@ xml-rs = "0.8.3"
 log = "0.4"
 
 [dev-dependencies]
-env_logger = "0.8.2"
+env_logger = "0.9.0"
 yaserde_derive = { version = "0.7.1", path = "../yaserde_derive" }
 
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