[3.10] bpo-43564: preserve original exception in args of FTP URLError (GH-24938) (#98138)

* bpo-43564: preserve original error in args of FTP URLError

* Add NEWS blurb

Co-authored-by: Carl Meyer <carljm@instagram.com>.
(cherry picked from commit ad817cd5c44416da3752ebf9baf16d650703275c)

Co-authored-by: Carl Meyer <carl@oddbird.net>

Co-authored-by: Carl Meyer <carl@oddbird.net>
2 files changed