test(django): Drop the json/str row from test_rest_framework_basic

The json/str scalar row takes the same request-body extraction branch as
the json/int scalar row already in the table and asserts the same shape,
so it only re-runs coverage the int row provides.

Author: ericapisani

tests/integrations/django/test_basic.py

@@ -1343,7 +1343,6 @@ def test_template_exception(
     [
         ["application/json", {"foo": "bar"}],
         ["application/json", 1],
-        ["application/json", "foo"],
         ["application/x-www-form-urlencoded", {"foo": "bar"}],
     ],
 )