fix(deps): update module github.com/azure/azure-sdk-for-go/sdk/azidentity to v1.15.0 (8.19)

[elastic-renovate-prod]

This PR contains the following updates:

Package	Change	Age	Confidence
github.com/Azure/azure-sdk-for-go/sdk/azidentity	v1.14.1 → v1.15.0

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Warning

Some dependencies could not be looked up. Check the Dependency Dashboard for more information.

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Release Notes

Azure/azure-sdk-for-go (github.com/Azure/azure-sdk-for-go/sdk/azidentity)

v1.15.0

1.15.0 (2026-10-14)

Features Added

• ManagedIdentityCredential and DefaultAzureCredential support user-assigned managed identities
  on Azure Arc when the agent supports them
• WorkloadIdentityCredential supports identity binding mode via WorkloadIdentityCredentialOptions.EnableAzureProxy

Bugs Fixed

• ManagedIdentityCredential verifies the Service Fabric endpoint's certificate against
  IDENTITY_SERVER_THUMBPRINT and rejects redirects

Other Changes

• On Service Fabric, a custom ClientOptions.Transport must be an *http.Client with a nil
  Transport or a standard *http.Transport without custom TLS dialing or verification callbacks.
  Unsupported transports now cause credential construction to fail
• Upgraded dependencies

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This PR has been generated by Mend Renovate CLI.

[elastic-renovate-prod]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
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The artifact failure details are included below:

File name: go.sum

go: go.mod requires go >= 1.27.2 (running go 1.27.1; GOTOOLCHAIN=local)