Django-upgrade

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* Fix circular import error when running django-upgrade.

Thanks to Michal Čihař for the report in `Issue 503 <https://github.com/adamchainz/django-upgrade/issues/503>`__.

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* Avoid accidental removal of comments a removed ``if`` block in the versioned block fixer.

Thanks to Tobias Funke for the report in `Issue 495 <https://github.com/adamchainz/django-upgrade/issues/495>`__.

* Add all-version fixer to remove outdated test skip decorators.

`Issue 364 <https://github.com/adamchainz/django-upgrade/issues/364>`__.

* Drop Python 3.8 support.

* Support Python 3.13.

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* Add Django 5.0+ fixer to rewrite ``format_html()`` calls without ``args`` or ``kwargs`` probably using ``str.format()`` incorrectly.

`Issue 477 <https://github.com/adamchainz/django-upgrade/issues/477>`__.

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* Fix the ``admin_register`` fixer to avoid rewriting when there are duplicate ``ModelAdmin`` classes in the file.

`Issue 471 <https://github.com/adamchainz/django-upgrade/issues/471>`__.

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* Add Django 4.2+ fixer to rewrite ``index_together`` declarations into ``indexes`` declarations in model ``Meta`` classes.
This fixer can make changes that require migrations.
Add a `test for pending migrations <https://adamj.eu/tech/2024/06/23/django-test-pending-migrations/>`__ to ensure that you do not miss these.

`PR 464 <https://github.com/adamchainz/django-upgrade/pull/464>`__.

* Fix tracking of AST node parents.
This may have fixed some subtle bugs in these fixers:

* ``admin_register``
* ``assert_form_error``
* ``default_app_config``
* ``management_commands``
* ``request_headers``
* ``settings_database_postgresql``
* ``settings_storages``
* ``testcase_databases``
* ``use_l10n``
* ``utils_timezone``

If you see any new changes, or had them previously disabled, please report an issue so we can extra tests to the test suite.

`PR 465 <https://github.com/adamchainz/django-upgrade/pull/465>`__.

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* Support Django 5.1 as a target version.

* Add Django 5.1+ fixer to rewrite the ``check`` keyword argument of ``CheckConstraint`` to ``condition``.