🎨 Made manager attributes more flexible

Changed run_after, retryable_on and continue_on to be type Container.
We don't need them to be sets.

The performance gain of sets over small tuples is nonexistant
for in checks and the  syntax is more verbose.

src/store/managers/local_cover_manager.py

@@ -9,7 +9,7 @@ from src.utils.save_cover import save_cover, resize_cover
 class LocalCoverManager(Manager):
     """Manager in charge of adding the local cover image of the game"""
 
-    run_after = set((SteamAPIManager,))
+    run_after = (SteamAPIManager,)
 
     def manager_logic(self, game: Game, additional_data: dict) -> None:
         # Ensure that the cover path is in the additional data