Update dependency Microsoft.Identity.Web to 3.4.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
Microsoft.Identity.Web	3.2.2 -> 3.4.0

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Release Notes

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

v3.4.0

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• Updated to Microsoft.IdentityModel.* 8.2.1
• Updated to Microsoft.Identity.Abstractions 7.2.0

New features

• Add ROPC flow support for confidential client applications. See 3091, 3129, 3139.
• Allow multi-tenant applications to specify the AppHomeTenantId to be used for client credentials. See 3121, 3132.
• Update to use .NET 9 GA. See 3127.

v3.3.1

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• Updated to Microsoft.IdentityModel.* 8.2.0

Supportability

• Added JSON schema support for Microsoft.Identity.Web configuration. This allows for schema validation in the appsettings.json, improving configuration accuracy and developer experience. To use it, add the following at the top of your appsettings.json:
  "$schema": "https://github.com/AzureAD/microsoft-identity-web/blob/master/JsonSchemas/microsoft-identity-web.json"
  This update enhances the configuration process by providing clear structure and validation for settings used in Microsoft.Identity.Web. See PR #​3119 for details.

Fundamentals

• Fix a flaky test in the L1L2Cache tests. See PR #​3122 for details.

v3.3.0

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• Updated to Microsoft.Identity.Client 4.66.0
• Update system.Text.Json to 8.0.5 CVE-2024-43485
• Updated to .NET 9 RC2

New features

• Microsoft.Identity.Web token acquisitio now provides an extensibility mechanism to enlight non-standard features. For details, see #​2975

Fundamentals

• Split DownstreamApi methods between AoT compatible and incompatible methods by @​SaurabhMSFT in https://github.com/AzureAD/microsoft-identity-web/pull/3090
• ASP.NET Core (and other) cross-link updates by @​guardrex in https://github.com/AzureAD/microsoft-identity-web/pull/3096. Thank you!
• Onboarded to Threading Analyzers. For details, see #​3052
• display code coverage as PR comments
• Fix flaky EncryptionTestAsync on .NET 9.

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