fix: Fixed 5.3 compilation error due to SetActivityTimeout only being available in 5.4+

Author: NCMcClure

NodeToCode.uplugin

@@ -1,7 +1,7 @@
 {
     "FileVersion":  1,
-    "Version":  0,
-    "VersionName":  "1.2.0",
+    "Version":  1,
+    "VersionName":  "1.2.1",
     "FriendlyName":  "Node to Code",
     "Description":  "Quickly translate any Unreal Engine Blueprint to C++",
     "Category":  "Code Plugins",

Source/Private/LLM/N2CHttpHandlerBase.cpp

@@ -45,8 +45,12 @@ void UN2CHttpHandlerBase::PostLLMRequest(
 
     Request->SetContentAsString(Payload);
     Request->SetTimeout(RequestTimeout);
-    Request->SetActivityTimeout(RequestTimeout);
 
+    // SetActivityTimeout is only available in UE5.4 and later
+#if ENGINE_MAJOR_VERSION >= 5 && ENGINE_MINOR_VERSION >= 4
+    Request->SetActivityTimeout(RequestTimeout);
+#endif
+    
     // Create a weak pointer to this for safety
     TWeakObjectPtr<UN2CHttpHandlerBase> WeakThis(this);