fix types

Author: sai6855

packages/mui-utils/src/getReactNodeRef/getReactNodeRef.ts

@@ -9,8 +9,8 @@ import * as React from 'react';
  */
 export default function getReactNodeRef(element: React.ReactNode): React.Ref<any> | null {
   // 'ref' is passed as prop in React 19, whereas 'ref' is directly attached to children in older versions
-  return (element as any)!.props.propertyIsEnumerable('ref')
-    ? (element as any)!.props.ref
+  return (element as any).props.propertyIsEnumerable('ref')
+    ? (element as any).props.ref
     : // @ts-expect-error element.ref is not included in the ReactElement type
       // We cannot check for it, but isValidElement is true at this point
       // https://github.com/DefinitelyTyped/DefinitelyTyped/discussions/70189