Support AzureML Instance MI with Microsoft.Identity.Client 4.70.1 or higher

[embetten]

For artifacts-keyring that is used in Azure ML instances, we need to bump the Microsoft.Identity.Client to 4.70.1 or higher to support managed identities to incorporate thisfix:

https://github.com/AzureAD/microsoft-authentication-library-for-dotnet/releases/tag/4.70.1