Revert "Allow IPv6 for Livebook Teams"

This reverts commit 935e484580.

lib/livebook/teams/requests.ex

@@ -267,7 +267,6 @@ defmodule Livebook.Teams.Requests do
   defp build_req() do
     Req.new(
       base_url: Livebook.Config.teams_url(),
-      inet6: true,
       headers: [{"x-lb-version", Livebook.Config.app_version()}]
     )
   end

lib/livebook/teams/web_socket.ex

@@ -26,7 +26,7 @@ defmodule Livebook.Teams.WebSocket do
       if http_scheme == :https do
         [cacerts: :public_key.cacerts_get()]
       else
-        [inet6: true]
+        []
       end
 
     opts = [protocols: [:http1], transport_opts: transport_opts]