Add Django 6.0 support

[MehrazRumman]

This PR adds official Django 6.0 support.

Key changes :

• Add Django 6.0 environments to tox test matrix (py312 & py313)
• Adjust tests to handle Django 6.0 behavior changes:
  * Updated URL validation test for .gov differences across versions
  * Fixed values_list() usage for Django 6 compatibility
  * Added DEFAULT_AUTO_FIELD = AutoField in tests to match previous behavior
  * Added Django upper bound to prevent unsupported versions in CI

Notes

• BigAutoField migration will be handled in a future PR if needed.

[MehrazRumman]

Removing as.d8f.ghj8.gov, from correct_urls, Behavior changed in Django different versions. This is reconiged as correct in python 3.14 with django 5.2 but python 3.13 and django main (development) it is incorrect !

[MehrazRumman]

@auvipy please review this PR !

[Copilot]

Pull Request Overview

This PR adds support for Django 6.0 beta testing and fixes compatibility issues with Django 6.0 changes. The key changes are:

• Adding Django 6.0 beta to the test matrix for Python 3.12 and 3.13
• Fixing a test compatibility issue with Django 6.0's values_list() behavior
• Adjusting a URL validation test for changes in Django's URL handling

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
tox.ini	Adds Django 6.0 beta (6.0b1) to the test environment matrix for py312 and py313
tests/test_validators.py	Fixes values_list() call to explicitly specify 'id' field for Django 6.0 compatibility
tests/test_templatetags.py	Adds URLIZE_ASSUME_HTTPS=True setting and removes a URL test case incompatible with Django 6.0

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[browniebroke]

I believe the new failures are coming from a combination of #9775 and the fact that in Django 6.0 DEFAULT_AUTO_FIELD setting now defaults to BigAutoField

Comment was addressed

[browniebroke]

Alternatively, we could switch this to BigAutoField, but that requires a number of changes in the tests. We could either do it now or in a follow up change, but I think this one keeps the PR small and focused.

[browniebroke]

This actually broke our CI on the main branch because the base and dist tox targets are installing "django" without upper bound. Added one here.

[auvipy]

can we open a new issue for tracking it?

[browniebroke]

Tracking the switch to BigAutoField you mean?

[auvipy]

yes yes

[auvipy]

looks better

[auvipy]

need to resolve the merge conflict again