Bump azure-identity from 1.15.0 to 1.16.1 in /model-engine

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](Azure/azure-sdk-for-python@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>

Author: dependabot[bot]

model-engine/requirements.in

@@ -5,7 +5,7 @@ aioredis~=2.0
 alembic==1.8.1
 asyncpg==0.27.0
 azure-containerregistry~=1.2.0
-azure-identity~=1.15.0
+azure-identity~=1.16.1
 azure-keyvault-secrets~=4.7.0
 azure-servicebus~=7.11.4
 azure-storage-blob~=12.19.0