Pass test for TokenEndpointAuthenticationSigningAlgorithmsSupported

Author: josephdecock

identity-model/src/IdentityModel/Client/Messages/DiscoveryDocumentResponse.cs

@@ -258,8 +258,7 @@ protected override Task InitializeAsync(object? initializationData = null)
     /// Gets the signing algorithms supported by the token endpoint for the signature on the JWT used to authenticate
     /// the client at the token endpoint for the "private_key_jwt" and "client_secret_jwt" authentication methods.
     /// </summary>
-    public IEnumerable<string> TokenEndpointAuthenticationSigningAlgorithmsSupported => [];
-
+    public IEnumerable<string> TokenEndpointAuthenticationSigningAlgorithmsSupported => TryGetStringArray(OidcConstants.Discovery.TokenEndpointAuthenticationSigningAlgorithmsSupported);
 
     /// <summary>
     /// Gets the supported backchannel token delivery modes.