chore(deps): update dotnet-azure-ad-identitymodel-extensions monorepo to 8.19.1

[descope]

This PR contains the following updates:

Package	Type	Update	Change	OpenSSF
Microsoft.IdentityModel.Protocols.OpenIdConnect	nuget	minor	8.18.0 → 8.19.1
System.IdentityModel.Tokens.Jwt	nuget	minor	8.18.0 → 8.19.1

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Release Notes

AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet (Microsoft.IdentityModel.Protocols.OpenIdConnect)

v8.19.1

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Bug Fixes

• Update JwtSecurityTokenHandler for IssuerSigningKeyResolverUsingConfiguration to take priority over IssuerSigningKeyResolver, matching the documented contract and the correct behavior already present in JsonWebTokenHandler. See PR #​3519.

v8.19.0

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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.

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