Bumps [env_logger](https://github.com/env-logger-rs/env_logger) from 0.7.1 to 0.8.1.
- [Release notes](https://github.com/env-logger-rs/env_logger/releases)
- [Changelog](https://github.com/env-logger-rs/env_logger/blob/master/CHANGELOG.md)
- [Commits](env-logger-rs/env_logger@v0.7.1...v0.8.1)

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