Update src/Microsoft.OpenApi/Reader/OpenApiModelFactory.cs

Co-authored-by: Vincent Biret <[email protected]>

Author: MaggieKimani1

src/Microsoft.OpenApi/Reader/OpenApiModelFactory.cs

@@ -196,7 +196,7 @@ public static T Parse<T>(string input,
         {
             format ??= InspectInputFormat(input);
             settings ??= new OpenApiReaderSettings();
-            var stream = new MemoryStream(Encoding.UTF8.GetBytes(input));
+            using var stream = new MemoryStream(Encoding.UTF8.GetBytes(input));
             return Load<T>(stream, version, format, out diagnostic, settings);
         }