build(deps): Update prost-build requirement from 0.8 to 0.9 (#2288)

Updates the requirements on [prost-build](https://github.com/tokio-rs/prost) to permit the latest version.
- [Release notes](https://github.com/tokio-rs/prost/releases)
- [Commits](tokio-rs/prost@v0.8.0...v0.9.0)

---
updated-dependencies:
- dependency-name: prost-build
  dependency-type: direct:production
...

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

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

Author: dependabot[bot]

core/Cargo.toml

@@ -50,7 +50,7 @@ quickcheck = "0.9.0"
 wasm-timer = "0.2"
 
 [build-dependencies]
-prost-build = "0.8"
+prost-build = "0.9"
 
 [features]
 default = ["secp256k1"]

protocols/floodsub/Cargo.toml

@@ -21,4 +21,4 @@ rand = "0.7"
 smallvec = "1.6.1"
 
 [build-dependencies]
-prost-build = "0.8"
+prost-build = "0.9"

protocols/gossipsub/Cargo.toml

@@ -40,4 +40,4 @@ hex = "0.4.2"
 derive_builder = "0.10.0"
 
 [build-dependencies]
-prost-build = "0.8"
+prost-build = "0.9"

protocols/identify/Cargo.toml

@@ -27,4 +27,4 @@ libp2p-noise = { path = "../../transports/noise" }
 libp2p-tcp = { path = "../../transports/tcp" }
 
 [build-dependencies]
-prost-build = "0.8"
+prost-build = "0.9"

protocols/kad/Cargo.toml

@@ -35,4 +35,4 @@ libp2p-yamux = { path = "../../muxers/yamux" }
 quickcheck = "0.9.0"
 
 [build-dependencies]
-prost-build = "0.8"
+prost-build = "0.9"

protocols/relay/Cargo.toml

@@ -26,7 +26,7 @@ void = "1"
 wasm-timer = "0.2"
 
 [build-dependencies]
-prost-build = "0.8"
+prost-build = "0.9"
 
 [dev-dependencies]
 env_logger = "0.9.0"

protocols/rendezvous/Cargo.toml

@@ -32,4 +32,4 @@ rand = "0.8"
 tokio = { version = "1", features = [ "rt-multi-thread", "time", "macros", "sync", "process", "fs", "net" ] }
 
 [build-dependencies]
-prost-build = "0.8"
+prost-build = "0.9"

transports/noise/Cargo.toml

@@ -35,4 +35,4 @@ quickcheck = "0.9.0"
 sodiumoxide = "0.2.5"
 
 [build-dependencies]
-prost-build = "0.8"
+prost-build = "0.9"

transports/plaintext/Cargo.toml

@@ -25,4 +25,4 @@ quickcheck = "0.9.0"
 rand = "0.7"
 
 [build-dependencies]
-prost-build = "0.8"
+prost-build = "0.9"