WIP: CI: Use pylint, instead of pylint3
It seems, despite the name, both packages depend on Python 3. However, pylint3 seems deprecated, and upstream recommends to install pylint: https://www.pylint.org/#install
The current versions of both packages in Debian unstable are:
This commit fixes failing CI jobs due to the use of pylint3 2.2.2-1, which seems broken.