fix(cli): Import annotations from __future__ to keep Python 3.9 compatibility
As we use type annotaions, CLI will break when using Python 3.9. This patch introduces the proper import to keep it working. Can be removed once we drop support for Python 3.9 in future.
(cherry picked from commit 5ffe2886)
Co-authored-by: Leandro Nunes Leandro.Nunes@arm.com