deposit: eonasdan-bootstrap-datetimepicker fix

• Locks the bundle version of the library to 3.1.3, because the latest one (4.0.0) is not working properly. (addresses #2689)

Signed-off-by: Sebastian Witowski <sebastian.witowski@cern.ch>
Reviewed-by: Jiri Kuncar <jiri.kuncar@cern.ch>