gc fixes (#19781)

code/controllers/subsystem/jobs.dm

@@ -595,7 +595,7 @@ SUBSYSTEM_DEF(jobs)
 		var/datum/department_member/member = new
 		member.name = H.real_name
 		member.role = job.title
-		member.member_account = account
+		member.set_member_account(account) //we need to set this through a proc so we can register signals
 		member.can_approve_crates = job?.department_account_access
 		department.members += member
 

code/game/jobs/departments.dm

@@ -32,6 +32,15 @@
 	///This department members money account
 	var/datum/money_account/member_account
 
+
+/datum/department_member/proc/set_member_account(datum/money_account/account)
+	member_account = account
+	RegisterSignal(account, COMSIG_PARENT_QDELETING, PROC_REF(clear_member_account))
+
+/datum/department_member/proc/clear_member_account(datum/money_account/account)
+	UnregisterSignal(account, COMSIG_PARENT_QDELETING)
+	member_account = null
+
 /datum/station_department/can_vv_delete()
 	message_admins("An admin attempted to VV delete a station_department datum, please stop doing this it will break cargo")
 	return FALSE