Bump django-stubs from 1.12.0 to 1.13.0

[dependabot[bot]]

Bumps django-stubs from 1.12.0 to 1.13.0.

Commits

• d489959 Release django-stubs and django-stubs-ext
• 0381fdb Add some types to views (#1221)
• f566734 Re-allow expressions in UniqueConstraint (#1220)
• 2a17d3f Remove bad redirect_chain attributes (#1148)
• 8f475fa Fill remaining missing hints with Any & disallow partial hints (#1206)
• e3c131b Add type hints to all test code (#1217)
• 9b4162b Auto-update pre-commit hooks (#1216)
• 7bce5c2 BaseDeleteView now extends FormMixin (#1215)
• 875acf7 Fixed F's asc and desc args (#1213)
• 36044c9 Add lots of missing argument & return type hints (#1204)
• Additional commits viewable in compare view

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