We never used Data::Dumper in this script. The only reference
of it was always commented out and removed over a decade ago in
commit 4bc87a28be020a6bf7387161c65ea3d8e4a0228b
("send-email: Change from Mail::Sendmail to Net::SMTP")
Signed-off-by: Eric Wong <normalperson@yhbt.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>