📌(backend) ping django<6.0.0

We want to wait before migrating to django 6. For now we require all
versions less than version 6 and we add a rule in renovate configuration

renovate.json

@@ -25,6 +25,12 @@
       "matchPackageNames": ["pylint"],
       "allowedVersions": "<4.0.0"
     },
+    {
+      "groupName": "allowed django versions",
+      "matchManagers": ["pep621"],
+      "matchPackageNames": ["django"],
+      "allowedVersions": "<6.0.0"
+    },
     {
       "enabled": false,
       "groupName": "ignored js dependencies",

src/backend/pyproject.toml

@@ -39,7 +39,7 @@ dependencies = [
     "django-redis==6.0.0",
     "django-storages[s3]==1.14.6",
     "django-timezone-field>=5.1",
-    "django==6.0",
+    "django<6.0.0",
     "django-treebeard==4.8.0",
     "djangorestframework==3.16.1",
     "drf_spectacular==0.29.0",