fix: try to fix error on update on computer switch off

lib/shutdown_installer.py

@@ -13,7 +13,7 @@ import time
 from datetime import datetime
 
 import state as state_mod
-from package_manager import install_packages, is_pacman_locked
+from package_manager import upgrade_cached_packages, is_pacman_locked
 
 logging.basicConfig(
     level=logging.INFO,
@@ -209,7 +209,7 @@ def run():
 
     try:
         display.update(f"Installation de {len(names)} paquet(s)…")
-        result = install_packages(names)
+        result = upgrade_cached_packages(names)
 
     except Exception as e:
         logger.exception(f"Erreur inattendue : {e}")