Bump django-mptt from 0.16.0 to 0.18.0

[dependabot]

Bumps django-mptt from 0.16.0 to 0.18.0.

Changelog

Sourced from django-mptt's changelog.

========== Change log

Next version

0.18

• Fixed the way indexes are defined for Django 5 and better.

0.17

• Added support for Python 3.13 and Django 5.1 and 5.2.
• Dropped Django < 4.2.

0.16

• Fixed get_cached_trees if there are multiple trees in the queryset.
• Added support for Python 3.12, Django 5.0.
• Added codespell and ruff checks to the CI.
• Fixed rebuilding using custom managers not named objects.

0.15

• Since I unfortunately still depend on django-mptt in prehistoric projects I took it upon me to make it runnable again. This doesn't mean I want to maintain the package.
• Added Django 4.2.
• Dropped Python < 3.9, Django < 3.2.
• Started using ruff and more rules.
• Dropped the index_together check on Django 5 and better. Django 5 only supports Meta.indexes.
• Optimized tree rebuilding.
• Added support for the Django admin theme switcher.
• Switched to hatchling.

0.14

• Merged the docs/upgrade.rst file into the main CHANGELOG.rst.
• Fixed the Sphinx autodoc configuration to also work locally. Ensured that readthedocs is able to build the docs again.
• Fixed a bug where DraggableMPTTAdmin assumed that the user model's

... (truncated)

Commits

• db95b79 django-mptt 0.18
• f740c78 Merge pull request #845 from francoisfreitag/django5
• c30eb1e Handle Django 5 indexes for MPTTModelBase
• c10d26c Remove duplicate index_together logic in MPTTModelBase
• 755b128 Merge pull request #843 from jonasdlindner/main
• 96aa684 docs: fix indentation for mptt_level_indent
• 6ed29fe django-mptt 0.17
• ccdef7e Update the linting configuration a bit
• 93e51c8 Modernize support for Django and Python versions. (#841)
• 93edc49 Restore tests on the Django main branch.
• Additional commits viewable in compare view

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