Adds sounds to conveyor belt switch (#86158)

## About The Pull Request
Adds sounds to conveyor belt switches



https://github.com/user-attachments/assets/1d399bea-262e-4ef1-8ee5-d10abad09ddd
## Why It's Good For The Game
Helps with the immersion, especially in cargo where where the techs are
often switching it on and off

## Changelog
🆑 Hardly
sound: Added sounds for conveyor belt switches
/🆑

code/modules/recycling/conveyor.dm

@@ -434,6 +434,8 @@ GLOBAL_LIST_EMPTY(conveyors_by_id)
 /// Updates the switch's `position` and `last_pos` variable. Useful so that the switch can properly cycle between the forwards, backwards and neutral positions.
 /obj/machinery/conveyor_switch/proc/update_position(direction)
 	if(position == CONVEYOR_OFF)
+		playsound(src, 'sound/machines/lever_start.ogg', 40, TRUE)
+
 		if(oneway)   //is it a oneway switch
 			position = oneway
 		else
@@ -442,6 +444,7 @@ GLOBAL_LIST_EMPTY(conveyors_by_id)
 			else
 				position = CONVEYOR_BACKWARDS
 	else
+		playsound(src, 'sound/machines/lever_stop.ogg', 40, TRUE)
 		position = CONVEYOR_OFF
 
 /obj/machinery/conveyor_switch/proc/on_user_activation(mob/user, direction)

sound/machines/license.txt

@@ -7,4 +7,8 @@ coffeemaker_brew.ogg originally made by Adriana Lopez (Acekat13X31), edited to r
 This is licensed under CC-BY 4.0, found at https://creativecommons.org/licenses/by/4.0/
 
 shutter.ogg adapted from Joseph Sardin on BigSoundBank
-https://bigsoundbank.com/detail-2475-manual-roller-shutter-closing-out-2.html
+https://bigsoundbank.com/detail-2475-manual-roller-shutter-closing-out-2.html
+
+lever_start.ogg and lever_stop.ogg are made by A_Kuha on FreeSound
+https://freesound.org/people/A_Kuha/sounds/676412
+This is licensed under CC-0, found at https://creativecommons.org/publicdomain/zero/1.0/