build(deps): update prost-build requirement from 0.12.0 to 0.13.1

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)
- [Changelog](https://github.com/tokio-rs/prost/blob/master/CHANGELOG.md)
- [Commits](tokio-rs/prost@v0.12.0...v0.13.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

poem-grpc-build/Cargo.toml

@@ -14,7 +14,7 @@ categories = ["network-programming", "asynchronous"]
 
 [dependencies]
 prettyplease = "0.2.9"
-prost-build = "0.12.0"
+prost-build = "0.13.1"
 quote.workspace = true
 proc-macro2.workspace = true
 syn.workspace = true