* Bump `tokio` to 1.17.0
* Bump the `tokio` version in the test service too
* Revert changes to `bridges/relays/client-substrate/Cargo.toml`
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>