build(deps): update prost-types requirement from 0.11.0 to 0.12.3

Updates the requirements on [prost-types](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-types-0.11.1...v0.12.3)

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

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

Cargo.toml

@@ -23,7 +23,7 @@ itoa = "1.0"
 parking_lot = "0.12"
 prometheus-client-derive-encode = { version = "0.4.1", path = "derive-encode" }
 prost = { version = "0.11.0", optional = true }
-prost-types = { version = "0.11.0", optional = true }
+prost-types = { version = "0.12.3", optional = true }
 
 [dev-dependencies]
 async-std = { version = "1", features = ["attributes"] }