ci: fix some pylint issues
- I wasn't able to use
--install-types
with mypy to hotfix the reported issue, not sure why - not sure how to fix pylint pyroute2 stuff...
- when I tried to use
debian-11
image instead ofdebian-buster
, sanity test for precursor started to fail with a single test: https://gitlab.nic.cz/knot/deckard/-/jobs/617032