Switch pylint from module to cli

Currently the pipeline is failing.

Looking at job unstable, using https://salsa.debian.org/debian/devscripts/-/jobs/3733897 as an example:

FAIL: test_pylint (devscripts.test.test_pylint.PylintTestCase)
Test: Run pylint on Python source code
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/builds/debian/devscripts/scripts/devscripts/test/test_pylint.py", line 76, in test_pylint
[...]
  File "/usr/lib/python3/dist-packages/pylint/config/arguments_manager.py", line 50, in <module>
    import tomli as tomllib
ModuleNotFoundError: No module named 'tomli'

MR is based on https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1027759