[chore:] changes from github

CombineAddresses.cs

@@ -16,12 +16,20 @@ public class CombineAddresses
     public async Task<KasAddressList> Perform(List<KasAddressList> address_lists)
     {
         KasAddressList result = new();
-        for (var i = 0; i < address_lists.Count; i++)
-            if (i == 0)
-                result = address_lists[i];
-            else
-                result = await Merge(result, address_lists[i], i + 1, address_lists.Count);
-
+        await Task.Run(async () =>
+        {
+            for (var i = 0; i < address_lists.Count; i++)
+                if (i == 0)
+                    lock (result)
+                    {
+                        result = address_lists[i];
+                    }
+                else
+                    lock (result)
+                    {
+                        result = Merge(result, address_lists[i], i + 1, address_lists.Count).Result;
+                    }
+        });
         return result;
     }