Fix naive datetime WARNINGS when running pytest

[markcerv]

When running pytest, getting multiple "...received a naive datetime ... while time zone support is active" warnings. Let's get those cleaned up.

========================================================= warnings summary ==========================================================
home/tests/integration/views/api/test_admin.py::TestAdminViews::test_get_home_users_daily
  /usr/local/lib/python3.13/site-packages/django/db/models/fields/__init__.py:1665: RuntimeWarning: DateTimeField Account.created received a naive datetime (3000-02-28 00:00:00) while time zone support is active.
    warnings.warn(

home/tests/integration/views/api/test_admin.py::TestAdminViews::test_get_home_users_daily
  /usr/local/lib/python3.13/site-packages/django/db/models/fields/__init__.py:1665: RuntimeWarning: DateTimeField Account.created received a naive datetime (3000-03-15 00:00:00) while time zone support is active.
    warnings.warn(

home/tests/integration/views/api/test_admin.py::TestAdminViews::test_get_users
home/tests/integration/views/api/test_admin.py::TestAdminViews::test_get_users_by_zip
home/tests/integration/views/api/test_export.py::TestExportViews::test_export_users
  /usr/local/lib/python3.13/site-packages/django/db/models/fields/__init__.py:1606: RuntimeWarning: DateTimeField Account.created received a naive datetime (3000-03-01 00:00:00) while time zone support is active.
    warnings.warn(

home/tests/integration/views/api/test_admin.py::TestAdminViews::test_get_users
home/tests/integration/views/api/test_admin.py::TestAdminViews::test_get_users_by_zip
home/tests/integration/views/api/test_export.py::TestExportViews::test_export_users
  /usr/local/lib/python3.13/site-packages/django/db/models/fields/__init__.py:1606: RuntimeWarning: DateTimeField Account.created received a naive datetime (3000-03-15 00:00:00) while time zone support is active.
    warnings.warn(

home/tests/integration/views/api/test_admin.py::TestAdminViews::test_get_users
home/tests/integration/views/api/test_export.py::TestExportViews::test_export_users
  /usr/local/lib/python3.13/site-packages/django/db/models/fields/__init__.py:1606: RuntimeWarning: DateTimeField IntentionalWalk.start received a naive datetime (3000-03-07 00:00:00) while time zone support is active.
    warnings.warn(

home/tests/integration/views/api/test_admin.py::TestAdminViews::test_get_users
home/tests/integration/views/api/test_export.py::TestExportViews::test_export_users
  /usr/local/lib/python3.13/site-packages/django/db/models/fields/__init__.py:1606: RuntimeWarning: DateTimeField IntentionalWalk.start received a naive datetime (3000-03-15 00:00:00) while time zone support is active.
    warnings.warn(

home/tests/integration/views/api/test_export.py::TestExportViews::test_export_users
  /usr/local/lib/python3.13/site-packages/django/db/models/fields/__init__.py:1606: RuntimeWarning: DateTimeField IntentionalWalk.start received a naive datetime (3000-02-28 00:00:00) while time zone support is active.
    warnings.warn(

home/tests/integration/views/web/test_data.py::TestCsvViews::test_user_agg_csv_view
  /usr/local/lib/python3.13/site-packages/django/db/models/fields/__init__.py:1606: RuntimeWarning: DateTimeField IntentionalWalk.end received a naive datetime (3000-03-07 00:00:00) while time zone support is active.
    warnings.warn(

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
================================================= 80 passed, 14 warnings in 28.61s ==================================================