Test eventing with libcouchbase 3.2.2 and update build to use this

In order to pick up various fixes and prepare to pick up later changes such as those under CCBC-1411, please test eventing with libcouchbase 3.2.latest and update the manifest accordingly.

While these haven't been found in eventing testing, there are a few important issues targeting the 3.2.1 of libcouchbase, which is expected to be available in the August cadence. See the releases in JIRA for details on content.