Update PostgreSQL to latest versions.
The PostgreSQL Global Development Group has released an update to all supported
versions of our database system, including 9.6.1, 9.5.5, 9.4.10, 9.3.15,
9.2.19, and 9.1.24.
This release fixes two issues that can cause data corruption, which are
described in more detail below. It also patches a number of other bugs reported
over the last three months. The project urges users to apply this update at the
next possible downtime.