pip(deps): update azure-identity requirement from >=1.19.0 to >=1.26.0

[dependabot]

Updates the requirements on azure-identity to permit the latest version.

Release notes

Sourced from azure-identity's releases.

azure-identity_1.26.0

1.26.0 (2026-09-30)

Features Added

• ManagedIdentityCredential now supports user-assigned managed identities on Azure Arc-enabled servers. An identity can be selected by client ID, object ID, or resource ID. Token responses that do not confirm the requested identity are rejected. (#48967)

Bugs Fixed

• Fixed synchronous Service Fabric managed identity authentication with MSAL 1.39.0 and later. Service Fabric now uses the session from an Azure Core RequestsTransport. (#48967)
• Fixed an issue where AuthorizationCodeCredential and the asynchronous OnBehalfOfCredential could return a cached token for another account when multiple credentials shared a token cache. (#49001)

Other Changes

• Added RequestIdPolicy to the default pipeline policies to ensure a unique x-ms-client-request-id header is sent with each request. (#46070)
• CertificateCredential now passes the PEM private key to MSAL as a str rather than bytes, matching MSAL's documented client_credential contract. (#46801)
• Bumped the minimum dependency on msal to >=1.39.0.

Commits

• 30d8bb9 [identity] prepare azure-identity 1.26.0 release (#49290)
• c7148b7 [identity] Enable user-assigned managed identity for AzureArcCredential (#48967)
• c5b1f4f [Identity] Fix identity cache issue (#49001)
• 9d085c1 [AutoPR azure-mgmt-compute-bulkaction]-generated-from-SDK Generation - Python...
• efc412d [TA] fix release error (#49261)
• 3d9b8b3 Prepare Responses 2.3.0b2 release (#49281)
• 8e49d15 [AutoPR azure-mgmt-resiliencemanagement]-generated-from-SDK Generation - Pyth...
• ef68c78 Preserve canonical agent reference in response snapshots (#49256)
• 3754db9 Configurations: 'specification/applink/AppLink.Management/tspconfig.yaml', a...
• 0929352 [Mgmt] Make review drafts and incomplete outcomes reliable (#49275)
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