deps: update to django5

[matthewelwell]

Changes

Depends on:

• deps: update django to 5.2.9 flagsmith-common#149
• flagsmith/flagsmith-auth-controller#36

Upgrade to django 5.

There were seemingly very few changes that were needed, and most of the updates in this PR relate to typing updates which I've tried to fix where possible but erred on the side of type: ignore comments where needed.

The main breaking changes that required handling on our end were:

1. Model.Meta.index_together was removed. I've replaced usages of this with models.Index(fields=[...]). This change does result in a migration applied to the database in the form of a RenameIndex but from what I can tell, this is a very minor operation and doesn't require any locks on the data in the table, or the index, only on the metadata for the table.
2. django.utils.timezone.utc was removed. I've replaced this with datetime.timezone.utc, but since we still want to use django.utils.timezone for other logic, (e.g. timezone.now()), I've imported datetime.timezone as dttz where needed.

I also had to update a few dependencies to support the django upgrade:

1. django-debug-toolbar
2. django-softdelete
3. djoser

Note that the upgrade of django-debug-toolbar meant that I needed to remove DEBUG = True from the test settings (conversation on the actual LoC for clarification).

How did you test this code?

Unit tests, and running locally.

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3 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
docs	Ignored	Preview	Feb 2, 2026 3:12pm
flagsmith-frontend-preview	Ignored	Preview	Feb 2, 2026 3:12pm
flagsmith-frontend-staging	Ignored	Preview	Feb 2, 2026 3:12pm

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.19%. Comparing base (608ef49) to head (db82530).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6452      +/-   ##
==========================================
+ Coverage   98.18%   98.19%   +0.01%     
==========================================
  Files        1294     1297       +3     
  Lines       46994    47001       +7     
==========================================
+ Hits        46141    46153      +12     
+ Misses        853      848       -5     

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[matthewelwell]

Minor comments for context where needed.

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-private-cloud:pr-6452	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-e2e:pr-6452	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-6452	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api-test:pr-6452	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-6452	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-6452	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-6452	Finished ✅	Results ✅

[khvn26]

LGTM 👍