chore(deps): bump github.com/Azure/azure-sdk-for-go/sdk/azidentity

Bumps [github.com/Azure/azure-sdk-for-go/sdk/azidentity](https://github.com/Azure/azure-sdk-for-go) from 1.2.1 to 1.6.0.
- [Release notes](https://github.com/Azure/azure-sdk-for-go/releases)
- [Changelog](https://github.com/Azure/azure-sdk-for-go/blob/main/documentation/release.md)
- [Commits](Azure/azure-sdk-for-go@sdk/azidentity/v1.2.1...sdk/azcore/v1.6.0)

---
updated-dependencies:
- dependency-name: github.com/Azure/azure-sdk-for-go/sdk/azidentity
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>