Fixed #23008 -- Fixed typo causing bad migration dependencies.

Thanks semenov for the report and Florian for investigation.

django/db/migrations/autodetector.py

@@ -254,13 +254,13 @@ def _detect_changes(self, convert_apps=None, graph=None):
                                     # If we can't find the other app, we add a first/last dependency,
                                     # but only if we've already been through once and checked everything
                                     if chop_mode:
-                                        # If the app already exists, we add __last__, as we don't know which
+                                        # If the app already exists, we add __latest__, as we don't know which
                                         # migration contains the target field.
                                         # If it's not yet migrated or has no migrations, we use __first__
                                         if graph and not graph.root_nodes(dep[0]):
                                             operation_dependencies.add((dep[0], "__first__"))
                                         else:
-                                            operation_dependencies.add((dep[0], "__last__"))
+                                            operation_dependencies.add((dep[0], "__latest__"))
                                     else:
                                         deps_satisfied = False
                     if deps_satisfied:

tests/migrations/test_autodetector.py

@@ -1057,4 +1057,4 @@ def test_last_dependency(self):
         self.assertOperationTypes(changes, 'otherapp', 0, ["CreateModel"])
         self.assertOperationAttributes(changes, 'otherapp', 0, 0, name="Book")
         # Right dependencies?
-        self.assertEqual(changes['otherapp'][0].dependencies, [("migrations", "__last__")])
+        self.assertEqual(changes['otherapp'][0].dependencies, [("migrations", "__latest__")])