[Snyk] Security upgrade @azure/identity from 3.4.2 to 4.2.1

[FoolBuildAgent]

This PR was automatically created by Snyk using the credentials of a real user.


Snyk has created this PR to fix 1 vulnerabilities in the npm dependencies of this project.

Snyk changed the following file(s):

• plugins/azure-sites-backend/package.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') SNYK-JS-AZUREIDENTITY-7246760	561

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