use raw string around regex to make go lint happy

builder/hyperv/common/step_set_first_boot_device.go

@@ -67,7 +67,7 @@ func ParseBootDeviceIdentifier(deviceIdentifier string, generation uint) (string
 	// not a simple option, check for a controllerType:controllerNumber:controllerLocation formatted
 	// device..
 
-	r, err := regexp.Compile("^(IDE|SCSI):(\\d+):(\\d+)$")
+	r, err := regexp.Compile(`^(IDE|SCSI):(\\d+):(\\d+)$`)
 	if err != nil {
 		return "", 0, 0, err
 	}