Update dependency Azure.Identity to v1.8.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
Azure.Identity (source)	nuget	minor	1.7.0 -> 1.8.0

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Release Notes

Azure/azure-sdk-for-net

### [`v1.8.0`](https://togithub.com/Azure/azure-sdk-for-net/releases/tag/Azure.Identity_1.8.0) ##### 1.8.0 (2022-11-08) ##### Bugs Fixed - Fixed error message parsing in `AzureCliCredential` which would misinterpret AAD errors with the need to login with `az login`. [#​26894](https://togithub.com/Azure/azure-sdk-for-net/issues/26894), [#​29109](https://togithub.com/Azure/azure-sdk-for-net/issues/29109) - `ManagedIdentityCredential` will no longer fail when a response received from the endpoint is invalid JSON. It now treats this scenario as if the credential is unavailable. [#​30467](https://togithub.com/Azure/azure-sdk-for-net/issues/30467), [#​32061](https://togithub.com/Azure/azure-sdk-for-net/issues/32061)

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