Test dependabot for Dockerfiles & Bump Postgres to 11 (#557)

* Test dependabot for Dockerfiles.

* Also for github actions

* Update dependabot.yml

* Fix urls.py for new versions of Django

* Fix urls.py for postorius.

* Bump dependency on Postgresql.

* Bump dependency on Django

* Add dependency on tzdata.

web/Dockerfile.dev

@@ -33,10 +33,11 @@ RUN --mount=type=cache,target=/root/.cache \
         mysqlclient \
         xapian-haystack \
         django-auth-ldap \
-		python-memcached \
+	python-memcached \
+	tzdata \
         diskcache \
         django-utils-six \
-    && python3 -m pip install -U 'Django<3.2' \
+    && python3 -m pip install -U 'Django<4.3' \
     && python3 -m pip install -U \
        git+https://gitlab.com/mailman/django-mailman3 \
     && apk del .build-deps \

web/mailman-web/urls.py

@@ -16,20 +16,19 @@
 # You should have received a copy of the GNU General Public License along with
 # Postorius.  If not, see <http://www.gnu.org/licenses/>.
 
-
-from django.conf.urls import include, url
+from django.conf.urls import include
 from django.contrib import admin
-from django.urls import reverse_lazy
+from django.urls import path, reverse_lazy
 from django.views.generic import RedirectView
 
 urlpatterns = [
-    url(r'^$', RedirectView.as_view(
+    path(r'^$', RedirectView.as_view(
         url=reverse_lazy('list_index'),
         permanent=True)),
-    url(r'^postorius/', include('postorius.urls')),
-    url(r'^hyperkitty/', include('hyperkitty.urls')),
-    url(r'', include('django_mailman3.urls')),
-    url(r'^accounts/', include('allauth.urls')),
+    path(r'postorius/', include('postorius.urls')),
+    path(r'hyperkitty/', include('hyperkitty.urls')),
+    path(r'', include('django_mailman3.urls')),
+    path(r'accounts/', include('allauth.urls')),
     # Django admin
-    url(r'^admin/', admin.site.urls),
+    path(r'^admin/', admin.site.urls),
 ]