Bump prost from 0.9.0 to 0.10.3 (#11425)

Bumps [prost](https://github.com/tokio-rs/prost) from 0.9.0 to 0.10.3.
- [Release notes](https://github.com/tokio-rs/prost/releases)
- [Commits](https://github.com/tokio-rs/prost/compare/v0.9.0...v0.10.3)

---
updated-dependencies:
- dependency-name: prost
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

substrate/client/authority-discovery/Cargo.toml

@@ -24,7 +24,7 @@ futures-timer = "3.0.1"
 ip_network = "0.4.1"
 libp2p = { version = "0.44.0", default-features = false, features = ["kad"] }
 log = "0.4.17"
-prost = "0.9"
+prost = "0.10"
 rand = "0.7.2"
 thiserror = "1.0"
 prometheus-endpoint = { package = "substrate-prometheus-endpoint", version = "0.10.0-dev", path = "../../utils/prometheus" }