Python: Enable python3.12 support

Python 3.12 has released, so update the test infrastructure to test
against this version. Update the configure script to look for it when an
explicit Python interpreter isn't chosen.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Message-id: 20231006195243.3131140-5-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>

tests/docker/dockerfiles/python.docker

@@ -11,7 +11,11 @@ ENV PACKAGES \
     python3-pip \
     python3-tox \
     python3-virtualenv \
-    python3.10
+    python3.10 \
+    python3.11 \
+    python3.12 \
+    python3.8 \
+    python3.9
 
 RUN dnf install -y $PACKAGES
 RUN rpm -q $PACKAGES | sort > /packages.txt