Bump azure-identity in /examples/Python/python-django-webapp-sample (#927)

Bumps [azure-identity](https://github.com/Azure/azure-sdk-for-python) from 1.12.0 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_1.12.0...azure-identity_1.16.1)

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

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examples/Python/python-django-webapp-sample/requirements.txt

@@ -1,5 +1,5 @@
 Django==4.1.13
 whitenoise==6.4.0
 azure-appconfiguration-provider==1.2.0
-azure-identity==1.12.0
+azure-identity==1.16.1
 featuremanagement==1.0.0b1