Update prost requirement from 0.13 to 0.14 in /spiffe

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)
- [Changelog](https://github.com/tokio-rs/prost/blob/master/CHANGELOG.md)
- [Commits](tokio-rs/prost@v0.13.0...v0.14.0)

---
updated-dependencies:
- dependency-name: prost
  dependency-version: 0.14.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

spiffe/Cargo.toml

@@ -29,7 +29,7 @@ time = "0.3"
 tonic = "0.13.0"
 
 # workload-api dependencies:
-prost = { version = "0.13", optional = true }
+prost = { version = "0.14", optional = true }
 prost-types = { version = "0.13", optional = true }
 tokio = { version = "1", features = ["net"], optional = true }
 tokio-stream = { version = "0.1", optional = true }