python: silence pylint raising-non-exception error

As of (at least) pylint 3.3.1, this code trips pylint up into believing
we are raising something other than an Exception. We are not: the first
two values may indeed be "None", but the last and final value must by
definition be a SystemExit exception.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-ID: <20241101173700.965776-5-jsnow@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

python/scripts/mkvenv.py

@@ -379,6 +379,9 @@ def make_venv(  # pylint: disable=too-many-arguments
         try:
             builder.create(str(env_dir))
         except SystemExit as exc:
+            # pylint 3.3 bug:
+            # pylint: disable=raising-non-exception, raise-missing-from
+
             # Some versions of the venv module raise SystemExit; *nasty*!
             # We want the exception that prompted it. It might be a subprocess
             # error that has output we *really* want to see.