Bump @azure/identity from 4.1.0 to 4.2.1

[dependabot[bot]]

Bumps @azure/identity from 4.1.0 to 4.2.1.

Commits

• 183d301 Upgrade to a version ESRP Release that supports federated auth (#29612)
• 9a2afdf [identity] Prep for release (#29981)
• 3caf203 [identity] Prepare identity for May release (#29441)
• 0a69729 [core] CHANGELOG date for @​azure-rest/core-client release (#29440)
• 88d244a Sync eng/common directory with azure-sdk-tools for PR 8158 (#29423)
• 7706373 [template-dpg] Suppress build failure (#29437)
• 769c1b1 [EngSys] Update name of @​azure-tools/test-utils NO_CI
• 8cd5bc2 [core] New multipart/form-data primitive in core-client-rest (#29047)
• 73b9faa [identity] Add changelog entry for MSALClient migration (#29419)
• b8e63a5 Post release automated changes for notificationhubs releases (#29431)
• Additional commits viewable in compare view

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