build(deps): update prost-build requirement in /bigtable_rs

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@v0.12.2...v0.13.1)

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

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

Author: dependabot[bot]

bigtable_rs/Cargo.toml

@@ -35,5 +35,5 @@ serde_path_to_error = "0.1.8"
 
 [build-dependencies]
 tonic-build = { version = "0.11.0", features = ["cleanup-markdown"] }
-prost-build = "0.12.2"
+prost-build = "0.13.1"
 prost-wkt-build = "0.5.0"