Update dependency System.IdentityModel.Tokens.Jwt to 8.4.0

[devlead]

This PR contains the following updates:

Package	Type	Update	Change
System.IdentityModel.Tokens.Jwt	nuget	minor	8.3.1 -> 8.4.0

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Release Notes

AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet (System.IdentityModel.Tokens.Jwt)

v8.4.0

Compare Source

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New Features

• App context switch allows blocking or non-blocking calls for configuration. See PR #​3106 for details and issue #​3082 for details.
• IdentityModel now enables symmetric and asymmetric keys to be created publicly with JWK. See #​3094 for details.
• IdentityModel now allows specifying the HTTP protocol version and version policy. See #​2808 for details.

Repair items

• Add request count and duration telemetry for configuration requests. See #​3022 for details.
• KeyID should be present in exception messages and is no longer PII. See #​3104 for details.

Fundamentals

• Fix spelling issues in xml comments. See #​3117 for details.
• Fix comment coverage in PR builds. See #​3079 for details.

Work related to redesign of IdentityModel's token validation logic #​2711

• See #​3056. #​3100, #​3017, and #​3111.
• Add internal virtual on TokenHandler. See #​3084 for details.

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