message: Use StyledSystem.FontSizeProps in Button TS file
diff: @@ -118,8 +118,8 @@ declare module '@primer/components' {
  export interface ButtonProps
  extends BaseProps,
  CommonProps,
  + StyledSystem.FontSizeProps,
  Omit<React.ButtonHTMLAttributes<HTMLButtonElement>, 'color'> {
  - fontSize?: number
  variant?: 'small' | 'medium' | 'large'
  }
  