Companion for paritytech/substrate#12828 (#1939)

* Companion for paritytech/substrate#12764

* Remove `async-trait`

* Companion for paritytech/substrate#12828

* carg fmt

* Update client/relay-chain-minimal-node/src/network.rs

Co-authored-by: Bastian Köcher <[email protected]>

* update lockfile for {"polkadot", "substrate"}

---------

Co-authored-by: Bastian Köcher <[email protected]>
Co-authored-by: parity-processbot <>