Update CTK to current master

Summary: Necessary because only the newest CTK version is python 3 compatible

Test Plan: covered by current tests. successful builds on ubuntu und windows 10

Reviewers: O1 MITK Core, kislinsk

Reviewed By: O1 MITK Core, kislinsk

Maniphest Tasks: T26467

Differential Revision: https://phabricator.mitk.org/D208