Fix URL in Titanic Tutorial (#1623)

Summary:
Download URL for dataset in Titanic dataset has changed, so updates link to the new URL and reruns all cells to update outputs with latest versions of dependencies.

Pull Request resolved: #1623

Reviewed By: craymichael

Differential Revision: D77556656

Pulled By: vivekmig

fbshipit-source-id: afa06a4d3505c013a2b6b78ba45b8d059af8e77d

Author: vivekmig