DEVELOPERS: remove Andy Kennedy, e-mail is bouncing

Andy Kennedy (andy.kennedy@adtran.com)<mailto:andy.kennedy@adtran.com>

  The e-mail address you entered couldn't be found. Please check the
  recipient's e-mail address and try to resend the message. If the
  problem continues, please contact your helpdesk.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit bbb8ad687fa81da2eecaa168a94f5a2601d136e2)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

DEVELOPERS

@@ -155,9 +155,6 @@ F:	package/zstd/
 N:	Andrey Yurovsky <yurovsky@gmail.com>
 F:	package/rauc/
 
-N:	Andy Kennedy <andy.kennedy@adtran.com>
-F:	package/libunwind/
-
 N:	Angelo Compagnucci <angelo.compagnucci@gmail.com>
 F:	package/corkscrew/
 F:	package/fail2ban/