Update public API

Author: MaggieKimani1

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

@@ -1313,7 +1313,7 @@ namespace Microsoft.OpenApi.Reader
     public class OpenApiJsonReader : Microsoft.OpenApi.Interfaces.IOpenApiReader
     {
         public OpenApiJsonReader() { }
-        public Microsoft.OpenApi.Reader.ReadResult Read(System.IO.MemoryStream input, Microsoft.OpenApi.Reader.OpenApiReaderSettings settings = null) { }
+        public Microsoft.OpenApi.Reader.ReadResult Read(System.IO.MemoryStream input, Microsoft.OpenApi.Reader.OpenApiReaderSettings settings) { }
         public Microsoft.OpenApi.Reader.ReadResult Read(System.Text.Json.Nodes.JsonNode jsonNode, Microsoft.OpenApi.Reader.OpenApiReaderSettings settings, string format = null) { }
         public System.Threading.Tasks.Task<Microsoft.OpenApi.Reader.ReadResult> ReadAsync(System.IO.Stream input, Microsoft.OpenApi.Reader.OpenApiReaderSettings settings, System.Threading.CancellationToken cancellationToken = default) { }
         public T ReadFragment<T>(System.IO.MemoryStream input, Microsoft.OpenApi.OpenApiSpecVersion version, out Microsoft.OpenApi.Reader.OpenApiDiagnostic diagnostic, Microsoft.OpenApi.Reader.OpenApiReaderSettings settings = null)