Fortunately it is straightforward.
In Javascript Header Functions open Datepicker setup.
Edit the first line so it looks like this:
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<!--<script type="text/javascript" src="jquery-ui-1.12.1-datepicker.js"></script>-->
<script src="https://code.jquery.com/ui/1.13.3/jquery-ui.js"></script>
The neccessary options are preselected, just download using the button at the bottom and rename something like
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jquery-ui.min.datepicker-1.13.3.js
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<!--<script type="text/javascript" src="jquery-ui-1.12.1-datepicker.js"></script>
<script src="https://code.jquery.com/ui/1.13.3/jquery-ui.js"></script>-->
<script src="jquery-ui.min.datepicker-1.13.3.js"></script>