Fix lint error `UppercaseAttributedString` in `MDCButton`
Fix lint error `UppercaseAttributedString` in `MDCButton`

PiperOrigin-RevId: 322291368

material-components/material-components-ios,material-components/material-components-ios,material-components/material-components-ios,material-components/material-components-ios,material-components/material-components-ios