chore(deps): update dependency microsoft.identity.web to 4.12.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	OpenSSF
Microsoft.Identity.Web	nuget	minor	4.11.0 → 4.12.0

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Release Notes

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

v4.12.0

New features

• Implement IAuthorizationHeaderProvider2 (from Microsoft.Identity.Abstractions 12.3.0) on DefaultAuthorizationHeaderProvider and the public BaseAuthorizationHeaderProvider, exposing the metadata-rich CreateAuthorizationHeaderInformation* surface (returning OperationResult<AuthorizationHeaderInformation, AuthorizationHeaderError>) with binding-certificate propagation. DownstreamApi and MicrosoftIdentityMessageHandler now prefer IAuthorizationHeaderProvider2 for mTLS PoP and soft-deprecate the bound-only IBoundAuthorizationHeaderProvider path (kept as a fallback for source/binary compatibility).

Dependencies updates

• Update Microsoft.Identity.Abstractions to 12.3.0.

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