Update dependency azure-identity to v1.16.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
azure-identity (source)	1.15.0 -> 1.16.0

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Release Notes

Azure/azure-sdk-for-python (azure-identity)

### [`v1.16.0`](https://togithub.com/Azure/azure-sdk-for-python/releases/tag/azure-identity_1.16.0) ##### 1.16.0 (2024-04-09) ##### Other Changes - For IMDS requests in `ManagedIdentityCredential`, the retry backoff factor was reduced from 2 to 0.8 in order to avoid excessive retry delays and improve responsiveness. Users can customize this setting with the `retry_backoff_factor` parameter: `ManagedIdentityCredential(retry_backoff_factor=2)`. ([#​35070](https://togithub.com/Azure/azure-sdk-for-python/pull/35070))

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