message: Silence linter warning.
  Using the index as key is fine here since the order or number of weekdays
  will never change.
diff: @@ -61,7 +61,7 @@ export const CalendarHeader = ({
  {
  utils.getWeekdays().map((day, index) => (
  <Typography
  - key={index}
  + key={index} // eslint-disable-line react/no-array-index-key
  variant="caption"
  className={classes.dayLabel}
  >
  