Cherry-pick #12094 to 7.x: [Metricbeat][postgresql] Update lib/pq to fix #11393 #12121
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Cherry-pick of PR #12094 to 7.1 branch. Original message:
This updates github.com/lib/pq to the latest version to fix a socket leak when SSL is not enabled on the PostgreSQL server.
Fixes #11393