Bump Microsoft.IdentityModel.Abstractions from 8.18.0 to 8.19.1

[dependabot]

Updated Microsoft.IdentityModel.Abstractions from 8.18.0 to 8.19.1.

Release notes

Sourced from Microsoft.IdentityModel.Abstractions's releases.

8.19.1

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.

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.

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