Update mix tasks since User.info.info_changeset is deprecated

lib/mix/tasks/set_admin.ex

@@ -1,5 +1,6 @@
 defmodule Mix.Tasks.SetAdmin do
   use Mix.Task
+  import Ecto.Changeset
   alias Pleroma.User
 
   @doc """
@@ -9,21 +10,19 @@ defmodule Mix.Tasks.SetAdmin do
   def run([nickname | rest]) do
     Application.ensure_all_started(:pleroma)
 
-    status =
+    admin =
       case rest do
-        [status] -> status == "true"
+        [admin] -> admin == "true"
         _ -> true
       end
 
     with %User{local: true} = user <- User.get_by_nickname(nickname) do
-      info =
-        user.info
-        |> Map.put("is_admin", !!status)
+      info_cng = User.Info.admin_api_update(user.info, %{is_admin: !!admin})
+      user_cng = Ecto.Changeset.change(user)
+      |> put_embed(:info, info_cng) 
+      {:ok, user} = User.update_and_set_cache(user_cng)
 
-      cng = User.info_changeset(user, %{info: info})
-      {:ok, user} = User.update_and_set_cache(cng)
-
-      IO.puts("Admin status of #{nickname}: #{user.info["is_admin"]}")
+      IO.puts("Admin status of #{nickname}: #{user.info.is_admin}")
     else
       _ ->
         IO.puts("No local user #{nickname}")