[docs] Updated refs to Django docs [skip ci]

Author: nemesifier

docs/developer/cache.rst

@@ -4,7 +4,7 @@ Notification Cache
 In a typical OpenWISP installation, ``actor``, ``action_object`` and
 ``target`` objects are same for a number of notifications. To optimize
 database queries, these objects are cached using `Django's cache framework
-<https://docs.djangoproject.com/en/4.2/topics/cache/>`_. The cached values
+<https://docs.djangoproject.com/en/5.2/topics/cache/>`_. The cached values
 are updated automatically to reflect actual data from database. You can
 control the duration of caching these objects using
 :ref:`OPENWISP_NOTIFICATIONS_CACHE_TIMEOUT setting
@@ -52,4 +52,4 @@ following code in your ``apps.py``.
     signal. You can pass any value you want but it needs to be unique. For
     more details read `preventing duplicate signals section of Django
     documentation
-    <https://docs.djangoproject.com/en/4.2/topics/signals/#preventing-duplicate-signals>`_
+    <https://docs.djangoproject.com/en/5.2/topics/signals/#preventing-duplicate-signals>`_

docs/developer/extending.rst

@@ -63,7 +63,7 @@ removed:
 
 For more information about how to work with django projects and django
 apps, please refer to the `django documentation
-<https://docs.djangoproject.com/en/4.2/intro/tutorial01/>`_.
+<https://docs.djangoproject.com/en/5.2/intro/tutorial01/>`_.
 
 2. Install ``openwisp-notifications``
 -------------------------------------
@@ -137,7 +137,7 @@ Please refer to the following files in the sample app of the test project:
 
 For more information regarding the concept of ``AppConfig`` please refer
 to the `"Applications" section in the django documentation
-<https://docs.djangoproject.com/en/4.2/ref/applications/>`_.
+<https://docs.djangoproject.com/en/5.2/ref/applications/>`_.
 
 7. Create your custom models
 ----------------------------
@@ -152,7 +152,7 @@ You can add fields in a similar way in your ``models.py`` file.
 
     If you have questions about using, extending, or developing models,
     refer to the `"Models" section of the Django documentation
-    <https://docs.djangoproject.com/en/4.2/topics/db/models/>`_.
+    <https://docs.djangoproject.com/en/5.2/topics/db/models/>`_.
 
 8. Add swapper configurations
 -----------------------------
@@ -183,7 +183,7 @@ Create and apply database migrations:
 
 For more information, refer to the `"Migrations" section in the django
 documentation
-<https://docs.djangoproject.com/en/4.2/topics/migrations/>`_.
+<https://docs.djangoproject.com/en/5.2/topics/migrations/>`_.
 
 10. Create your custom admin
 ----------------------------
@@ -199,7 +199,7 @@ are described below.
     For more information regarding how the django admin works, or how it
     can be customized, please refer to `"The django admin site" section in
     the django documentation
-    <https://docs.djangoproject.com/en/4.2/ref/contrib/admin/>`_.
+    <https://docs.djangoproject.com/en/5.2/ref/contrib/admin/>`_.
 
 1. Monkey patching
 ~~~~~~~~~~~~~~~~~~
@@ -256,7 +256,7 @@ file in the test project.
 
 For more information about URL configuration in django, please refer to
 the `"URL dispatcher" section in the django documentation
-<https://docs.djangoproject.com/en/4.2/topics/http/urls/>`_.
+<https://docs.djangoproject.com/en/5.2/topics/http/urls/>`_.
 
 12. Create root routing configuration
 -------------------------------------
@@ -299,7 +299,7 @@ in `"templatetags/notification_tags.py" of sample_notifications
 
 For more information about template tags in django, please refer to the
 `"Custom template tags and filters" section in the django documentation
-<https://docs.djangoproject.com/en/4.2/topics/http/urls/>`_.
+<https://docs.djangoproject.com/en/5.2/topics/http/urls/>`_.
 
 16. Register Notification Types
 -------------------------------

docs/user/settings.rst

@@ -94,7 +94,7 @@ Configure Django's settings as follows:
     CSRF_COOKIE_DOMAIN = "example.com"
 
 Please refer to `Django's settings documentation
-<https://docs.djangoproject.com/en/4.2/ref/settings/>`_ for more
+<https://docs.djangoproject.com/en/5.2/ref/settings/>`_ for more
 information on ``SESSION_COOKIE_DOMAIN`` and ``CSRF_COOKIE_DOMAIN``
 settings.