build(deps): update prost requirement from 0.11 to 0.12

Updates the requirements on [prost](https://github.com/tokio-rs/prost) to permit the latest version.
- [Release notes](https://github.com/tokio-rs/prost/releases)
- [Commits](tokio-rs/prost@prost-build-0.11.1...v0.12.0)

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

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

abci/Cargo.toml

@@ -31,7 +31,7 @@ required-features = ["server"]
 [dependencies]
 tenderdash-proto = { version = "0.13.0-dev.2", path = "../proto" }
 bytes = { version = "1.0" }
-prost = { version = "0.11" }
+prost = { version = "0.12" }
 tracing = { version = "0.1", default-features = false }
 tracing-subscriber = { version = "0.3", optional = true, default-features = false, features = [
     "ansi",

proto/Cargo.toml

@@ -16,7 +16,7 @@ description = """
 all-features = true
 
 [dependencies]
-prost = { version = "0.11", default-features = false }
+prost = { version = "0.12", default-features = false }
 bytes = { version = "1.0", default-features = false, features = ["serde"] }
 serde = { version = "1.0", default-features = false, features = ["derive"] }
 subtle-encoding = { version = "0.5", default-features = false, features = [