Update release metadata for 2.4.5

Change-Id: I864a273b1b4d243902c931265eb6f6df36c6ac3b
Reviewed-on: http://review.couchbase.org/44434
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>