Adapt type annotations to django-stubs 6.1.2 (unblocks lock file maintenance)

[NumericalAdvantage]

Unblocks #305 (Renovate's lock file maintenance), whose CI has been failing the pyright step for three weeks, so its automerge never fired.

Type	Type-annotation fix, no behaviour change
Surface	radis/collections/views.py, radis/reports/api/serializers.py
Risk	None at runtime; annotations and an equivalent DRF call
Checks	pyright 0 errors with the current stubs (django-stubs 6.1.0 / pyright 1.1.411) and with the ones #305 brings (django-stubs 6.1.2 / pyright 1.1.414); collections and reports suites green

• form_valid in the collection create/update views takes ModelForm[Collection] instead of a bare BaseModelForm; django-stubs 6.1.2 gives CreateView/UpdateView a default form type (ModelForm[_M]), and the bare annotation is no longer assignable to it
• radis/collections/views.py gets from __future__ import annotations, because Django's ModelForm is not subscriptable at runtime (RADIS does not use the django-stubs-ext monkeypatch) and the annotation must not be evaluated
• ReportSerializer reads the groups field's queryset through get_queryset() (which already returns a fresh .all()), instead of the queryset attribute; django-stubs 6.1.2 adds a descriptor __get__ to Manager, which makes pyright reject attribute reads typed QuerySet | Manager | None on DRF fields

How this was verified

Reproduced the four CI errors locally with the environment from the Renovate branch (uv sync --frozen on renovate/lock-file-maintenance), applied the two changes, and ran pyright over the whole project in both environments: 0 errors in each. The affected test suites pass; nothing changes at runtime.

Once this is on main, Renovate rebases #305 and the lock file maintenance should automerge as configured.

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Reviewing files that changed from the base of the PR and between 766b52b and 70a7045.

📒 Files selected for processing (2)

• radis/collections/views.py
• radis/reports/api/serializers.py

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