chore: replace deprecated length_is template filter with length == #1037
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From https://django.readthedocs.io/en/latest/releases/4.2.html
length_is will be removed in Django 5.1, see https://docs.djangoproject.com/en/dev/internals/deprecation/
I noticed this warning in a project using django-grappelli and figured I'd help get out ahead of the removal with a PR. Let me know if this need any additional testing or work!