Removed Old PlayerSession Functions (#5404)

Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Server/Voting/Managers/VoteManager.DefaultVotes.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Content.Server.GameTicking;
@@ -85,7 +85,7 @@ namespace Content.Server.Voting.Managers
                 vote.CastVote(initiator, 0);
             }
 
-            foreach (var player in _playerManager.GetAllPlayers())
+            foreach (var player in _playerManager.ServerSessions)
             {
                 if (player != initiator && !_afkManager.IsAfk(player))
                 {