Update dependency Microsoft.Identity.Web to 3.9.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
Microsoft.Identity.Web	3.9.1 -> 3.9.4

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Release Notes

AzureAD/microsoft-identity-web (Microsoft.Identity.Web)

v3.9.4

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Package updates

• Microsoft.IdentityModel updated to version 8.12.1.

Bug fix

• Updates the DefaultAuthorizationHeaderProvider to update the AcquireTokenOptions.LongRunningWebApiSessionKey after the token is acquired so that the key can be used in the next OBO call. See PR #​3381 for details.

Fundamentals

• Update .NET SDK version to 9.0.107 used when building or running the code. See #​3385 for details.
• Improved test coverage for managed identity flows. See #​3350 for details.

v3.9.3

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Package updates

• Microsoft.IdentityModel updated to version 8.12.0.

Fundamentals

• Add .clinerules to help with AI tooling.
• Update PublicApiAnalyzers and BannedApiAnalyzers to 4.14.0
  Upgraded analyzer packages for improved diagnostics and code consistency (in particular delegates are added).
  For details see #​3379

v3.9.2

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Package updates

• Microsoft.IdentityModel updated to version 8.11.0.
• MSAL.NET updated to version MSAL.NET 4.72.1.

Fundamentals:

• Fix invalid comparisons in prop and csproj files. For details see #​3297.

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