build: Bump env_logger from 0.9.0 to 0.9.1

Bumps [env_logger](https://github.com/env-logger-rs/env_logger) from 0.9.0 to 0.9.1.
- [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/v0.9.0...v0.9.1)

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

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

vhost_user_block/Cargo.toml

@@ -7,7 +7,7 @@ edition = "2021"
 [dependencies]
 block_util = { path = "../block_util" }
 clap = { version = "3.2.22", features = ["wrap_help","cargo"] }
-env_logger = "0.9.0"
+env_logger = "0.9.1"
 epoll = "4.3.1"
 libc = "0.2.132"
 log = "0.4.17"