More adaptation for pydcs updates.

This is as much as we can do until pydcs actually adds the py.typed
file. Once that's added there are a few ugly monkey patching corners
that will just need `# type: ignore` for now, but we can't pre-add those
since we have mypy warning us about superfluous ignore comments.

(cherry picked from commit 96c7b87ac7)

gen/sam/group_generator.py

@@ -157,7 +157,7 @@ class ShipGroupGenerator(
         super().__init__(
             game,
             ground_object,
-            unitgroup.ShipGroup(self.game.next_group_id(), self.go.group_name),
+            unitgroup.ShipGroup(game.next_group_id(), ground_object.group_name),
         )
         self.faction = faction
         wp = self.vg.add_waypoint(self.position, 0)