chore; updates public api surface for missing cancellation token parameter

Signed-off-by: Vincent Biret <[email protected]>

Author: baywet

test/Microsoft.OpenApi.Tests/PublicApi/PublicApi.approved.txt

@@ -733,7 +733,7 @@ namespace Microsoft.OpenApi.Models
         public void SerializeAsV31(Microsoft.OpenApi.Writers.IOpenApiWriter writer) { }
         public void SetReferenceHostDocument() { }
         public static Microsoft.OpenApi.Reader.ReadResult Load(System.IO.MemoryStream stream, string? format = null, Microsoft.OpenApi.Reader.OpenApiReaderSettings? settings = null) { }
-        public static System.Threading.Tasks.Task<Microsoft.OpenApi.Reader.ReadResult> LoadAsync(string url, Microsoft.OpenApi.Reader.OpenApiReaderSettings? settings = null) { }
+        public static System.Threading.Tasks.Task<Microsoft.OpenApi.Reader.ReadResult> LoadAsync(string url, Microsoft.OpenApi.Reader.OpenApiReaderSettings? settings = null, System.Threading.CancellationToken token = default) { }
         public static System.Threading.Tasks.Task<Microsoft.OpenApi.Reader.ReadResult> LoadAsync(System.IO.Stream stream, string? format = null, Microsoft.OpenApi.Reader.OpenApiReaderSettings? settings = null, System.Threading.CancellationToken cancellationToken = default) { }
         public static Microsoft.OpenApi.Reader.ReadResult Parse(string input, string? format = null, Microsoft.OpenApi.Reader.OpenApiReaderSettings? settings = null) { }
     }