[fix] setup.py - packaging for 'answerers' to build a valid package

Fix installing answerers when installing SearXNG through a wheel [1].  These
files have been missed in commit d72fa99b.

Here is what have been tested:

    $ make clean py.build
    ...
    $ python -m venv test123
    $ . ./test123/bin/activate
    (test123) $ pip install dist/searxng-2024*-py3-none-any.whl
    (test123) $ SEARXNG_DEBUG=1 searxng-run

[1] https://github.com/searxng/searxng/pull/3045#issuecomment-1961767861

searx/answerers/random/answerer.py

@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
+# pylint: disable=missing-module-docstring
 
 import hashlib
 import random