Wagtail-autocomplete

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* Remove tests for Wagtail 4.2 and 5.0 as they have reached their EOL
* Added Wagtail 5.x and 6.x compatibility
* Added tests for Python 3.10 and 3.11
* Remove support for versions of Wagtail < 4.1 (Wagtail 4.1 or later now required)

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* Add handling of validation errors during creation of objects.
* Fix bug where searches failed if Django's CSRF cookie was configured with ``CSRF_COOKIE_HTTPONLY`` set to ``True``
* Update Javascript dependencies to remove security vulnerabilities.

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* Change the search view to use the HTTP POST method, which can prevent the request URI from becoming too long.
* New feature: add the possibility of a custom filter function.

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* Add Wagtail 3.x compatibility

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* Change in behavior: the autocomplete endpoint will return a 404 response if no objects are found.
* Update Javascript dependencies to remove security vulnerabilities.

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* Breaking change: Drop deprecated ``page_type`` and ``is_single`` arguments from ``AutocompletePanel``.
* Update the panel and widget codes based on panels of ``wagtail.admin.edit_handlers`` -- mainly ``PageChooserPanel``.
* Update Javascript dependencies to remove security vulnerabilities.
* Update use of deprecated ``django.conf.urls.url`` function.