Bump django-mptt from 0.11.0 to 0.13.4

[dependabot]

Bumps django-mptt from 0.11.0 to 0.13.4.

Changelog

Sourced from django-mptt's changelog.

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

Next version

• 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 primary key is called id.
• Ensured that we do not install the tests.myapp package.
• Added dark mode support to the draggable model admin.

0.13

• MARKED THE PROJECT AS UNMAINTAINED, WHICH IT STILL IS
• Reformatted everything using black, isort etc.
• Switched from Travis CI to GitHub actions.
• Switched to a declarative setup.
• Verified compatibility with Django up to 3.2 and Python up to 3.9. Dropped compatibility guarantees (ha!) with anything older than Django 2.2 and Python 3.6.
• Renamed the main development branch to main.
• Fixed a problem where our _get_user_field_names mistakenly returned abstract fields.
• Added a workaround for the default_app_config warning.
• Changed saving to always call get_ordered_insertion_target when using ordered insertion.
• Made it possible to override the starting level when using the tree node choice field.

0.12

• Add support for Django 3.1
• Drop support for Django 1.11.
• Drop support for Python 3.5.
• Fix an issue where the rebuild() method would not work correctly if you were using multiple databases.
• Update spanish translations.

0.11

• Add support for Django 3.0.
• Add support for Python 3.8.

... (truncated)

Commits

• 7a6a54c Merge pull request #801 from arrobalytics/main
• b17a3cc Merge remote-tracking branch 'origin/main' into main
• 5a2f7cb django-mptt 0.13.4
• e45426c Version Update
• f4dd4c3 BUGFIX: Cannot call get_descendants on unsaved models using PostgreSQL databa...
• 551d266 django-mptt 0.13.3
• 8353888 Merge pull request #799 from tfeldmann/main
• 55cd7eb fix asset paths
• 79301e1 Merge pull request #798 from tfeldmann/main
• 1a9c95b use default django css variables
• Additional commits viewable in compare view

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