Bump django-upgrade from 1.18.0 to 1.21.0

[dependabot]

Bumps django-upgrade from 1.18.0 to 1.21.0.

Changelog

Sourced from django-upgrade's changelog.

1.21.0 (2024-09-05)

• 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) <https://github.com/adamchainz/django-upgrade/issues/477>__.

1.20.0 (2024-07-19)

• 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) <https://github.com/adamchainz/django-upgrade/issues/471>__.

1.19.0 (2024-06-27)

• 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/issues/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/issues/465) <https://github.com/adamchainz/django-upgrade/pull/465>__.

Commits

• 090f59d Version 1.21.0
• ab52f96 [pre-commit.ci] pre-commit autoupdate (#486)
• b462175 Upgrade requirements (#485)
• 2eb9dea Move CI to Ubuntu 24.04 (#483)
• b66ed85 Add format_html() fixer (#478)
• 2d7d4a5 [pre-commit.ci] pre-commit autoupdate (#481)
• fcb83ad Upgrade requirements (#480)
• e7048a3 Move test requirement files into tests/ (#479)
• d81f7d8 Enable pytest xfail_strict
• 989d5d3 [pre-commit.ci] pre-commit autoupdate (#476)
• Additional commits viewable in compare view

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