use text instead of varchar for token fields

priv/repo/migrations/20241217005445_convert_token_fields_to_text.exs

@@ -0,0 +1,10 @@
+defmodule Algora.Repo.Local.Migrations.ConvertTokenFieldsToText do
+  use Ecto.Migration
+
+  def change do
+    alter table(:identities) do
+      modify :provider_token, :text, from: :string
+      modify :provider_refresh_token, :text, from: :string
+    end
+  end
+end