The version that we were capping to is no longer compatible with latest
upper-constraints.txt, so let us free float again.

The resulting linting errors are included for now to unblock the gate,
these will still need to be discussed or fixed later.

NOTE(kevko): Temporarily disabling horizon deployment, as it's not
possible to unblock gates without it

Co-Authored-By: Michal Arbet <michal.arbet@ultimum.io>
Change-Id: Ib7f72b2663199ef80844a412bc436c6ef09322cc