Update azure_identity requirement in /azure_devops_rust_api

Updates the requirements on [azure_identity](https://github.com/azure/azure-sdk-for-rust) to permit the latest version.
- [Release notes](https://github.com/azure/azure-sdk-for-rust/releases)
- [Commits](https://github.com/azure/azure-sdk-for-rust/compare/[email protected][email protected])

---
updated-dependencies:
- dependency-name: azure_identity
  dependency-version: 0.29.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

azure_devops_rust_api/Cargo.toml

@@ -39,7 +39,7 @@ once_cell = "1"
 uuid = { version = "1", features = ["serde", "v4", "js"] }
 
 [dev-dependencies]
-azure_identity = "0.28"
+azure_identity = "0.29"
 tokio = { version = "1", features = ["full"] }
 anyhow = "1"
 tracing-subscriber = "0.3"