Also remove the now unused license and update the qt_attribution.json
[ChangeLog][Third-Party Code] UCD-generated data files now come under Unicode-3.0
Change-Id: I133b1f20643e29a412053eb08ae4c250d07c561e
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
(cherry picked from commit d0bf0660b17af2545c7566329e4bad621c369fee)