chore(deps-dev): bump azure-identity in the azure-identity group

Bumps the azure-identity group with 1 update: [azure-identity](https://github.com/Azure/azure-sdk-for-python).


Updates `azure-identity` from 1.20.0 to 1.21.0
- [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_1.20.0...azure-identity_1.21.0)

---
updated-dependencies:
- dependency-name: azure-identity
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: azure-identity
...

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

Author: dependabot[bot]

requirements-dev.txt

@@ -5,7 +5,7 @@ astroid==3.3.9
 async-timeout==5.0.1
 attrs==25.1.0
 azure-core==1.32.0
-azure-identity==1.20.0
+azure-identity==1.21.0
 build==1.2.2.post1
 bumpver==2024.1130
 certifi==2025.1.31