adding test for latest versions of python and django

[kirmola]

Description

Describe:

• Content of the pull request
• Feature added / Problem fixed

References

Provide any github issue fixed (as in Fix #XYZ)

Checklist

• I have read the contribution guide
• Code lint checked via inv lint
• changes file included (see docs)
• Usage documentation added in case of new features
• Tests added

[protoroto]

@kirmola Thanks for contributing! In order to make the CI pass, we need a few changes here.

• I've opened an issue about this, to better track things -> Test agains python 3.12, 3.13 and Django 5.1 #216
• Could you please rename your branch to something like feature/issue-216-add-python-3.12-3-13-and-django-5.1-to-test-matrix ?
• Could you please create a changes/216.feature file, with content something like Add python 3.12, python 3.13 and Django 5.1 to test matrix? That's the text that will go in the HISTORY.rst file and in the changelog of the new release
• Given that we're adding compatibility with newer python and Django version, we should also update tox.ini file here https://github.com/nephila/django-meta/blob/develop/tox.ini#L11 and add the new Django costraint below here https://github.com/nephila/django-meta/blob/develop/tox.ini#L18 , so that locally tests will test against these new versions.
• Django 5.1 is only compatible with python >= 3.10 , so we should exclude python3.9-django5.1 both in tox.ini and .github/workflows/test.yml

If you need any help for these things, I'm more than happy to help you. Thanks again for opening this!