Update prost-types requirement from 0.8 to 0.11 (#74)

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@v0.8.0...v0.11.0)

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

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

Author: dependabot[bot]

Cargo.toml

@@ -33,7 +33,7 @@ prost = ["prost-types"]
 
 [dependencies]
 once_cell = "1.4"
-prost-types = { version = "0.8", optional = true }
+prost-types = { version = "0.11", optional = true }
 crossbeam-utils = "0.8.5"
 
 [target.'cfg(target_arch = "x86")'.dependencies]