Updates the requirements on django-filter to permit the latest version.

Sourced from django-filter's changelog.

Version 26.1 (2026-07-11)

• Added testing for Django 6.1.

  DRF integration will require the upcoming DRF v3.18. See encode/django-rest-framework#9978

• Added testing against Python 3.14.

Version 25.2 (2025-10-05)

• Added testing for Django 6.0.

• Dropped support for Django <5.2 LTS

• Dropped support for Python 3.9.

Version 25.1 (2025-02-14)

• Removed the in-built API schema generation methods, which have been deprecated since v23.2.

  You should use drf-spectacular <https://drf-spectacular.readthedocs.io/en/latest/>_ for generating OpenAPI schemas with DRF.

• Dropped support for EOL Python 3.8.

• Added testing against Python 3.13.

• Added official support for Django 5.2.

Version 24.3 (2024-08-02)

• Adds official support for Django 5.1.

• Allow using dictionaries for grouped choices on Django 5.0+.

  Thanks to Sævar Öfjörð Magnússon.

• Adds unknown_field_behavior FilterSet option to allowing warning and ignore behaviours for unknown field types during FilterSet generation.

  Thanks to Loes.

Version 24.2 (2024-03-27)

... (truncated)

• 52c3c0f Set date and bump version for 26.1 release.
• 6a3222a Add testing for Python 3.14.
• aa3bd8e Added testing against Django 6.1
• ec717ea Correct Language header in Greek locale file (el) (#1751)
• 31b297c Bump the github-actions group with 2 updates (#1733)
• 590c0a3 Fix version range for Django 6.0 (#1731)
• 6204bc4 Added release date for v25.2.
• See full diff in compare view

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