Update react-day-picker

[bhogan-mitre]

There is a first attempt in the date-picker-update branch, and some discussion attached to a commit there 89fb41f

Let's consolidate that discussion into an issue here so that it's easier to find and refer to.

[bhogan-mitre]

@dmt0 I understand the month navigation buttons are not currently working in that development branch. Here are a couple thoughts (copied over from the thread on that commit).

It looks like there is different behavior between providing month and defaultMonth. A quick try on my end to use defaultMonth did respond to changes in the <> buttons. Although the dropdown month and year controls above it weren't synced with those changes and would need additional tweaking. https://react-day-picker.js.org/api/interfaces/DayPickerBase#month

Maybe a better approach would be to remove those extra dropdowns above the DayPicker, and instead use dropdowns from within DayPicker (and in that way get rid of the <> buttons as well). That seems like it would better match the existing behavior. https://react-day-picker.js.org/basics/navigation#using-a-drop-down-to-change-the-month