Python dependency: Bump azure-mgmt-subscription from 3.0.0 to 3.1.1

Bumps [azure-mgmt-subscription](https://github.com/Azure/azure-sdk-for-python) from 3.0.0 to 3.1.1.
- [Release notes](https://github.com/Azure/azure-sdk-for-python/releases)
- [Commits](Azure/azure-sdk-for-python@azure-mgmt-subscription_3.0.0...azure-mgmt-subscription_3.1.1)

---
updated-dependencies:
- dependency-name: azure-mgmt-subscription
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -49,7 +49,7 @@ botocore==1.29.*
 urllib3==1.26.*
 azure-mgmt-rdbms==10.1.0
 azure-mgmt-resource==23.0.0
-azure-mgmt-subscription==3.0.0
+azure-mgmt-subscription==3.1.1
 azure-identity==1.12.0
 google-api-python-client==2.*
 google-auth-oauthlib==1.0.0