chore: Upgrade Django to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
Django (changelog)	>=5.2,<6.0 → >=6,<6.1

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Release Notes

django/django (Django)

v6.0.3

Compare Source

v6.0.2

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v6.0.1

Compare Source

v6.0

Compare Source

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• If you want to rebase/retry this PR, check this box

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch renovate/django-6.x

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