Wagtail-cache

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* Bug fix: Support Django 5.1

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* Bug fix: gracefully handle backend cache errors by returning the un-cached page and adding an ``X-Wagtail-Cache: err`` header. For example, if the cache backend/server is down, if the cache runs out of memory, etc. These errors are also logged using the ``wagtail-cache`` Python logger.

* Bug fix: prevent duplicate entries in the keyring (used to show a list of cached pages).

* Docs: clarify behavior of cache backend ``TIMEOUT`` setting. Move advanced docs from install page to a separate page to keep it simple for beginners.

* Switch from black, flake8, and isort to ruff. Switch from ``setup.py`` to ``pyproject.toml``.

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* Support Wagtail 6 and Django 5.1

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* Support Wagtail 5 and Django 4.2.

* Remove ``django-redis`` compatibility backend. Django 4.0+ has a native redis backend.

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* Support Wagtail 4 and Django 4.1.

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* Fix Django deprecation warnings.

* Previously, the feature to strip cookies was not triggered if the Vary header
contained something other than "Cookie", e.g. ``Vary: Language, Cookie``. This
change properly inspects and rebuilds the Vary header in such cases.