Fix all deprecation warnings generated by Django REST Framework during the unit tests:
* ``The `base_name` argument is pending deprecation in favor of `basename`.`` (86 occurrences)
* `` `detail_route` is deprecated and will be removed in 3.10 in favor of `action`, which accepts a `detail` bool. Use `@action(detail=True)` instead.`` (18 occurrences)
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