Update dependency azure-identity to v1.20.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
azure-identity (source)	==1.19.0 -> ==1.20.0

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Release Notes

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

v1.20.0

Compare Source

1.20.0 (2021-11-04)

Features Added

• GA send_request onto the azure.core.PipelineClient and azure.core.AsyncPipelineClient. This method takes in
  requests and sends them through our pipelines.
• GA azure.core.rest. azure.core.rest is our new public simple HTTP library in azure.core that users will use to create requests, and consume responses.
• GA errors StreamConsumedError, StreamClosedError, and ResponseNotReadError to azure.core.exceptions. These errors
  are thrown if you mishandle streamed responses from the azure.core.rest module
• add kwargs to the methods for iter_raw and iter_bytes #​21529
• no longer raise JSON errors if users pass in file descriptors of JSON to the json kwarg in HttpRequest #​21504
• Added new error type IncompleteReadError which is raised if peer closes the connection before we have received the complete message body.

Breaking Changes

• SansIOHTTPPolicy.on_exception returns None instead of bool.

Bugs Fixed

• The Content-Length header in a http response is strictly checked against the actual number of bytes in the body,
  rather than silently truncating data in case the underlying tcp connection is closed prematurely.
  (thanks to @​jochen-ott-by for the contribution) #​20412
• UnboundLocalError when SansIOHTTPPolicy handles an exception #​15222
• Add default content type header of text/plain and content length header for users who pass unicode strings to the content kwarg of HttpRequest in 2.7 #​21550

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