Allow higher versions for all dependencies

Instead of updating the requirements from time to time (like e.g. in !48 (merged)), I propose to allow higher versions by default.

Otherwise you would need to update the requirements much more often to avoid conflicts like #14 or this one I experienced today:

ERROR: dtcontrol 2.1.4 has requirement tqdm==4.62.3, but you'll have tqdm 4.65.0 which is incompatible.

What do you think about that?