message: Add a label to dialog close button
diff: @@ -333,7 +333,7 @@ const DialogCloseButton = styled(Button)`
  `
  const CloseButton: React.FC<{onClose: () => void}> = ({onClose}) => {
  return (
  - <DialogCloseButton onClick={onClose}>
  + <DialogCloseButton aria-label="Close" onClick={onClose}>
  <StyledOcticon icon={XIcon} />
  </DialogCloseButton>
  )
  