chore: remove propTypes extension as a PR is pending in @material/ui

mui/material-ui#30682

packages/next-ui/Button/Button.tsx

@@ -1,32 +1,5 @@
 /* eslint-disable react/forbid-foreign-prop-types */
 import { LoadingButton as Button, LoadingButtonProps } from '@mui/lab'
-import PropTypes, { Requireable } from 'prop-types'
-
-/**
- * This is temporary until Material UI solves that the variant proptype is not:
- *
- * ```ts
- * variant: PropTypes.oneOf(['contained', 'outlined', 'text'])
- * ```
- *
- * It should be something like
- *
- * ```ts
- * variant: PropTypes.oneOfType([
- *   PropTypes.oneOf(['contained', 'outlined', 'text']),
- *   PropTypes.string,
- * ]),
- * ```
- *
- * https://github.com/mui-org/material-ui/blob/master/packages/mui-lab/src/LoadingButton/LoadingButton.js#L269
- */
-type LoadingButtonPropTypes = typeof Button & { propTypes: Record<string, Requireable<any>> }
-if (process.env.NODE_ENV !== 'production' && (Button as LoadingButtonPropTypes).propTypes) {
-  ;(Button as LoadingButtonPropTypes).propTypes.variant = PropTypes.oneOfType([
-    (Button as LoadingButtonPropTypes).propTypes.variant,
-    PropTypes.string,
-  ])
-}
 
 export type ButtonProps = LoadingButtonProps
 export { Button }