bump LlamaLib to v1.2.6

Author: amakropoulos

Runtime/LLMUnitySetup.cs

@@ -103,7 +103,7 @@ public class LLMUnitySetup
         /// <summary> LLM for Unity version </summary>
         public static string Version = "v2.5.2";
         /// <summary> LlamaLib version </summary>
-        public static string LlamaLibVersion = "v1.2.5";
+        public static string LlamaLibVersion = "v1.2.6";
         /// <summary> LlamaLib release url </summary>
         public static string LlamaLibReleaseURL = $"https://github.com/undreamai/LlamaLib/releases/download/{LlamaLibVersion}";
         /// <summary> LlamaLib name </summary>