Flutter primary onPrimary deprecated

primary -> backgroundColor
onPrimary -> foregroundColor
に変更

before

      style: ElevatedButton.styleFrom(
	...
	primary: Colors.white,
	onPrimary: Colors.grey,
	...
      ),

after

      style: ElevatedButton.styleFrom(
	...
	backgroundColor: Colors.white,
	foregroundColor: Colors.grey,
	...
      ),