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