Bump prost from 0.7.0 to 0.8.0 (#9560)

Bumps [prost](https://github.com/tokio-rs/prost) from 0.7.0 to 0.8.0.
- [Release notes](https://github.com/tokio-rs/prost/releases)
- [Commits](https://github.com/tokio-rs/prost/compare/v0.7.0...v0.8.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

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

substrate/Cargo.lock

@@ -7336,7 +7336,7 @@ dependencies = [
  "libp2p",
  "log 0.4.14",
  "parity-scale-codec",
- "prost 0.7.0",
+ "prost 0.8.0",
  "prost-build 0.7.0",
  "quickcheck",
  "rand 0.7.3",
@@ -8001,7 +8001,7 @@ dependencies = [
  "parity-scale-codec",
  "parking_lot 0.11.1",
  "pin-project 1.0.5",
- "prost 0.7.0",
+ "prost 0.8.0",
  "prost-build 0.7.0",
  "quickcheck",
  "rand 0.7.3",

substrate/client/authority-discovery/Cargo.toml

@@ -26,7 +26,7 @@ ip_network = "0.4.0"
 libp2p = { version = "0.39.1", default-features = false, features = ["kad"] }
 log = "0.4.8"
 prometheus-endpoint = { package = "substrate-prometheus-endpoint", path = "../../utils/prometheus", version = "0.9.0" }
-prost = "0.7"
+prost = "0.8"
 rand = "0.7.2"
 sc-client-api = { version = "4.0.0-dev", path = "../api" }
 sc-network = { version = "0.10.0-dev", path = "../network" }

substrate/client/network/Cargo.toml

@@ -41,7 +41,7 @@ log = "0.4.8"
 parking_lot = "0.11.1"
 pin-project = "1.0.4"
 prometheus-endpoint = { package = "substrate-prometheus-endpoint", version = "0.9.0", path = "../../utils/prometheus" }
-prost = "0.7"
+prost = "0.8"
 rand = "0.7.2"
 sc-block-builder = { version = "0.10.0-dev", path = "../block-builder" }
 sc-client-api = { version = "4.0.0-dev", path = "../api" }