Walker does not visit OpenApiEncoding.Headers

[srev-saxo]

The OpenApiWalker.Walk(OpenApiEncoding) does not visit the OpenApiHeaders in the Headers property. See the following code:

        /// Visits <see cref="OpenApiEncoding"/> and child objects
        /// </summary>
        internal void Walk(OpenApiEncoding encoding)
        {
            if (encoding == null)
            {
                return;
            }

            _visitor.Visit(encoding);
            Walk(encoding as IOpenApiExtensible);
        }