build(deps): bump protobuf from 2.28.0 to 3.4.0

Bumps [protobuf](https://github.com/stepancheg/rust-protobuf) from 2.28.0 to 3.4.0.
- [Changelog](https://github.com/stepancheg/rust-protobuf/blob/master/CHANGELOG-before-3.md)
- [Commits](stepancheg/rust-protobuf@v2.28.0...v3.4.0)

---
updated-dependencies:
- dependency-name: protobuf
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

Cargo.lock

@@ -18,7 +18,7 @@ clap = { version = "4.2", features = ["cargo", "derive"] }
 regex = "1.7"
 riemann_client = { version = "0.9.0", optional = true }
 hostname = "0.3.1"
-protobuf = "2.28.0"
+protobuf = "3.4.0"
 serde = { version = "1.0", features = ["derive"], optional = true }
 serde_json = { version = "1.0", optional = true }
 ordered-float = "2.0"