Update prost requirement from 0.11.9 to 0.12.1

Updates the requirements on [prost](https://github.com/tokio-rs/prost) to permit the latest version.
- [Release notes](https://github.com/tokio-rs/prost/releases)
- [Commits](tokio-rs/prost@v0.11.9...v0.12.1)

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

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

Cargo.toml

@@ -26,7 +26,7 @@ ledger-transport = "0.10.0"
 ledger-transport-hid = "0.10.0"
 levenshtein = "1.0.5"
 obfstr = { version = "0.4.3", optional = true }
-prost = "0.11.9"
+prost = "0.12.1"
 rayon = "1.7.0"
 regex = "1.9.3"
 requestty = "0.5.0"