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

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

Author: MaggieKimani1

src/Microsoft.OpenApi/Reader/OpenApiModelFactory.cs

@@ -174,7 +174,7 @@ public static ReadResult Parse(string input,
             settings ??= new OpenApiReaderSettings();
 
             // Copy string into MemoryStream
-            var stream = new MemoryStream(Encoding.UTF8.GetBytes(input));
+            using var stream = new MemoryStream(Encoding.UTF8.GetBytes(input));
 
             return InternalLoad(stream, format, settings);
         }