fix(cockpit): replace packagekit with cockpit-packagekit

Same reason as previous commit — packagekit is a backend service
and not a cockpit component. cockpit-packagekit is the proper
frontend app that provides the software update UI inside Cockpit.
The split happened upstream in the cockpit packaging repo and is
also refferenced in cockpit-project/cockpit#19315.

archinstall/default_profiles/servers/cockpit.py

@@ -14,7 +14,7 @@ class CockpitProfile(Profile):
 	@override
 	def packages(self) -> list[str]:
 		# NOTE: udisks2 and packagekit are raw dependenices, not cockpit app components
-		return ['cockpit', 'cockpit-storaged', 'packagekit']
+		return ['cockpit', 'cockpit-storaged', 'cockpit-packagekit']
 
 	@property
 	@override