build(deps): bump prost-build from 0.12.4 to 0.12.6 (#170)

Bumps [prost-build](https://github.com/tokio-rs/prost) from 0.12.4 to 0.12.6.
- [Release notes](https://github.com/tokio-rs/prost/releases)
- [Commits](https://github.com/tokio-rs/prost/compare/v0.12.4...v0.12.6)

---
updated-dependencies:
- dependency-name: prost-build
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Cargo.toml

@@ -60,7 +60,7 @@ path-absolutize = "3.1.1"
 path-clean = "1.0.1"
 platform-info = "2.0.3"
 prost = "0.12.6"
-prost-build = "0.12.4"
+prost-build = "0.12.6"
 prost-reflect-build = "0.13.0"
 prost-types = "0.12.6"
 rand = "0.8.5"