Update rdkafka requirement from ^0.29.0 to ^0.34.0

Updates the requirements on [rdkafka](https://github.com/fede1024/rust-rdkafka) to permit the latest version.
- [Changelog](https://github.com/fede1024/rust-rdkafka/blob/master/changelog.md)
- [Commits](fede1024/rust-rdkafka@v0.29.0...v0.34.0)

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

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

Cargo.toml

@@ -82,7 +82,7 @@ optional = true
 
 [dev-dependencies]
 mockito = "^1.2.0"
-rdkafka = { version = "^0.29.0", features = ["cmake-build"] }
+rdkafka = { version = "^0.34.0", features = ["cmake-build"] }
 rand = "^0.8.5"
 test_utils = { path = "test_utils" }
 tokio = { version = "^1.32.0", features = ["macros"] }