MT#55283 add perl JSON lib to dependencies

The ng-client script uses the JSON module, so list it as dependency.

Change-Id: I87cb28e1bf25e7afa9eb0ea750eb8e5ccb605262
(cherry picked from commit 14dbc561a7)

debian/control

@@ -137,6 +137,7 @@ Depends:
  libdigest-hmac-perl,
  libio-socket-inet6-perl,
  libio-socket-ip-perl,
+ libjson-perl,
  libsocket6-perl,
  netcat-openbsd | netcat,
  ${misc:Depends},