update checkout action to version 2
update checkout action to version 2

dudi3001/CM-Well,e-orz/CM-Well,e-orz/CM-Well,e-orz/CM-Well,dudi3001/CM-Well,dudi3001/CM-Well,e-orz/CM-Well,dudi3001/CM-Well,dudi3001/CM-Well,e-orz/CM-Well