Update env_logger requirement from 0.6.0 to 0.7.0

Updates the requirements on [env_logger](https://github.com/sebasmagri/env_logger) to permit the latest version.
- [Release notes](https://github.com/sebasmagri/env_logger/releases)
- [Changelog](https://github.com/sebasmagri/env_logger/blob/master/CHANGELOG.md)
- [Commits](rust-cli/env_logger@v0.6.0...v0.7.0)

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

Author: dependabot-preview[bot]

Cargo.toml

@@ -27,7 +27,7 @@ crossbeam-utils = "0.6"
 crypto-hash = "0.3.1"
 curl = { version = "0.4.21", features = ['http2'] }
 curl-sys = "0.4.18"
-env_logger = "0.6.0"
+env_logger = "0.7.0"
 pretty_env_logger = { version = "0.3", optional = true }
 failure = "0.1.5"
 filetime = "0.2"