chore: Bump Microsoft.IdentityModel.Tokens from 8.16.0 to 8.19.0

[dependabot]

Updated Microsoft.IdentityModel.Tokens from 8.16.0 to 8.19.0.

Release notes

Sourced from Microsoft.IdentityModel.Tokens's releases.

8.19.0

New Features

• Add ML-DSA (FIPS 204) post-quantum signature support. See PR #​3479.
• Cache custom crypto providers in CryptoProviderFactory. See PR #​3489.

Bug Fixes

• Disable automatic redirects on default HttpClient for JKU retrieval. See PR #​3494.
• Adjust rented buffer handling in claim set parsing. See PR #​3493.
• Tidy null handling in SAML conditions validation. See PR #​3491.
• Improve validation of jku claim. See PR #​3481.
• Limit telemetry algorithm dimension cardinality. See PR #​3490.
• Add defensive copy of collections in ValidationParameters. See PR #​3492.
• Update TokenValidationParameter copy constructor to make a deep copy. See PR #​3488.
• Update to fail-closed when replay protection isn't configured and other DPoP hardening. See PR #​3505.
• Apply RFC 3986 section 6.2.2 normalization to DPoP htu comparison. See PR #​3509.

8.18.0

New Features

• Introduced a new interface IConfigurationEventHandlerContextAware<T> that provides context to the configuration event handler implementation, allowing it to optionally bypass a cache lookup. See PR #​3444.
• Added Microsoft.IdentityModel.Dpop — a new package implementing DPoP (Demonstrating Proof-of-Possession) per RFC 9449. Provides both client-side and server-side proof validation with no System.Net.Http dependency. See PR #​3443.

8.17.0

Dependencies

• Downgrade MicrosoftExtensionsLoggingAbstractionsVersion to 8.0.0 on .NET 10. See PR #​3435.

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