fix(swagger-ui-react): amend prop validation for plugins (#7900)

plugins prop can be defined as list of function as well.

flavors/swagger-ui-react/index.jsx

@@ -108,6 +108,7 @@ SwaggerUI.propTypes = {
   queryConfigEnabled: PropTypes.bool,
   plugins: PropTypes.oneOfType([
     PropTypes.arrayOf(PropTypes.object),
+    PropTypes.arrayOf(PropTypes.func),
     PropTypes.func,
   ]),
   displayOperationId: PropTypes.bool,