Revert "OBT1.1.0 Merge branch 'dev_pte' into dev"

This reverts commit 177cf89756, reversing
changes made to 42ba733cd4.

Barotrauma/BarotraumaShared/SharedSource/Characters/Talents/CharacterTalent.cs

@@ -1,8 +1,6 @@
 using Barotrauma.Abilities;
 using System;
-using System.Collections.Concurrent;
 using System.Collections.Generic;
-using System.Threading;
 
 namespace Barotrauma
 {
@@ -74,9 +72,7 @@ namespace Barotrauma
             }
         }
 
-        // ThreadLocal for thread-safe talent checking
-        private static readonly ThreadLocal<HashSet<Identifier>> checkedNonStackableTalentsLocal = new ThreadLocal<HashSet<Identifier>>(() => new HashSet<Identifier>());
-        private static HashSet<Identifier> checkedNonStackableTalents => checkedNonStackableTalentsLocal.Value;
+        private static readonly HashSet<Identifier> checkedNonStackableTalents = new();
 
         /// <summary>
         /// Checks talents for a given AbilityObject taking into account non-stackable talents.