Test against Django stable/5.2.x branch

.github/workflows/test.yml

@@ -29,6 +29,7 @@ concurrency:
 # - django 5.1, python 3.13, sqlite, parallel, USE_EMAIL_USER_MODEL=yes
 # - django 5.1, python 3.13, postgres:15, psycopg 3, parallel, DISABLE_TIMEZONE=yes
 # - django stable/5.1.x, python 3.11, postgres:15, psycopg 3 (allow failures)
+# - django stable/5.2.x, python 3.12, postgres:15, psycopg 3 (allow failures)
 # - django main, python 3.13, postgres:latest, psycopg 3, parallel (allow failures)
 # - elasticsearch 7, django 4.2, python 3.9, postgres:latest, psycopg 2
 # - opensearch 2, django 5.0, python 3.10, sqlite
@@ -109,6 +110,11 @@ jobs:
             psycopg: 'psycopg>=3.1.8'
             postgres: 'postgres:15'
             experimental: true
+          - python: '3.12'
+            django: 'git+https://github.com/django/django.git@stable/5.2.x#egg=Django'
+            psycopg: 'psycopg>=3.1.8'
+            postgres: 'postgres:15'
+            experimental: true
           - python: '3.13'
             django: 'git+https://github.com/django/django.git@main#egg=Django'
             psycopg: 'psycopg>=3.1.8'