updates github action config

Author: saxix

.github/workflows/tests.yaml

@@ -26,8 +26,8 @@ jobs:
         strategy:
             fail-fast: false
             matrix:
-                python-version: [ "3.8", "3.9", "3.10"]
-                django-version: [ "3.2", "4.0", "4.2"]
+                python-version: [ "3.9", "3.11"]
+                django-version: [ "3.2", "4.2"]
                 db-engine: ["pg", "mysql"]
         env:
             PY_VER: ${{ matrix.python-version}}

src/concurrency/admin.py

@@ -7,14 +7,14 @@
 from django.contrib.admin import helpers
 from django.core.checks import Error
 from django.core.exceptions import ImproperlyConfigured, ValidationError
+from django.db import transaction
 from django.db.models import Q
 from django.forms.formsets import INITIAL_FORM_COUNT, ManagementForm, MAX_NUM_FORM_COUNT, TOTAL_FORM_COUNT
 from django.forms.models import BaseModelFormSet
 from django.http import HttpResponse, HttpResponseRedirect
 from django.utils.encoding import force_str
 from django.utils.safestring import mark_safe
 from django.utils.translation import ngettext
-from django.db import transaction
 
 from concurrency import core, forms
 from concurrency.api import get_revision_of_object

src/concurrency/config.py

@@ -1,5 +1,3 @@
-import warnings
-
 from django.core.exceptions import ImproperlyConfigured
 from django.test.signals import setting_changed
 from django.utils.module_loading import import_string