Bump azure-identity from 1.15.0 to 1.16.1 in /src/drivers/test

Bumps [azure-identity](https://github.com/Azure/azure-sdk-for-python) from 1.15.0 to 1.16.1.
- [Release notes](https://github.com/Azure/azure-sdk-for-python/releases)
- [Changelog](https://github.com/Azure/azure-sdk-for-python/blob/main/doc/esrp_release.md)
- [Commits](https://github.com/Azure/azure-sdk-for-python/compare/azure-identity_1.15.0...azure-identity_1.16.1)

---
updated-dependencies:
- dependency-name: azure-identity
  dependency-type: direct:production
...

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

src/drivers/test/requirements.txt

@@ -4,7 +4,7 @@ openpyxl==3.1.2
 azure-common==1.1.28
 azure-core==1.29.7
 azure-data-tables==12.5.0
-azure-identity==1.15.0
+azure-identity==1.16.1
 azure-storage-blob==12.19.0
 azure-storage-common==2.1.0
 azure-storage-file==2.1.0