Update release metadata for 2.4.2

Change-Id: Id1a039bb81482f28e5e96737d74d370ef28be2fa
Reviewed-on: http://review.couchbase.org/41592
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>