chore(deps): bump tokio from 1.6.0 to 1.6.1 (#58)

Bumps [tokio](https://github.com/tokio-rs/tokio) from 1.6.0 to 1.6.1.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](tokio-rs/tokio@tokio-1.6.0...tokio-1.6.1)

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