Fix tests running in tox for Django 4.8

In Django 4.8 there is a change to the tests need as the date widget
was added - `admin/widgets/date.html`.

Also removing the package `importlib-metadata` as that no longer seems
to be needed and breaks when running tox locally or in GHA.

pyproject.toml

@@ -127,7 +127,6 @@ deps =
     black
     beautifulsoup4
     dj-database-url
-    importlib-metadata==4.13.0
     factory-boy
     django2: Django<3
     django3: Django<4

tests/test_admin_views.py

@@ -226,6 +226,7 @@ def test_detail(admin_client):
             {
                 "django/forms/div.html": 1,
                 "django/forms/errors/list/default.html": 2,
+                "admin/widgets/date.html": 3,
                 "django/forms/errors/list/ul.html": 56,
             }
         )
@@ -264,6 +265,7 @@ def test_detail(admin_client):
             {
                 "django/forms/div.html",
                 "django/forms/errors/list/default.html",
+                "admin/widgets/date.html",
                 "django/forms/errors/list/ul.html",
             }
         )