Bump bootstrap-datepicker from 1.8.0 to 1.9.0

Bumps [bootstrap-datepicker](https://github.com/uxsolutions/bootstrap-datepicker) from 1.8.0 to 1.9.0.
- [Release notes](https://github.com/uxsolutions/bootstrap-datepicker/releases)
- [Changelog](https://github.com/uxsolutions/bootstrap-datepicker/blob/master/CHANGELOG.md)
- [Commits](uxsolutions/bootstrap-datepicker@v1.8.0...v1.9.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>