Unrevert audio (#21330)

Co-authored-by: Pieter-Jan Briers <pieterjan.briers@gmail.com>

Content.Server/Pinpointer/ProximityBeeperSystem.cs

@@ -2,6 +2,7 @@
 using Content.Shared.Interaction.Events;
 using Content.Shared.Pinpointer;
 using Content.Shared.PowerCell;
+using Robust.Server.Audio;
 using Robust.Server.GameObjects;
 using Robust.Shared.Timing;