fix CI after flake8 upgrade and qemu-amd64 move
After upgrading flake8 in alpine edge, so it works again, we get two new errors.
F540 f-string is missing placeholder
Apparently I like the new f-strings so much that I used them even where they make no sense ;)
EDIT: another failure is related to the qemu-amd64 move. Fix that too.
Trivial fix, merging after CI passes.
Edited by Administrator