Cherry-pick #12094 to 7.x: [Metricbeat][postgresql] Update lib/pq to fix #11393#12121

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adriansr wants to merge 1 commit intoelastic:7.xfrom adriansr:backport_12094_7.x

+1,157-383

Commits on May 9, 2019

[Metricbeat][postgresql] Update lib/pq to fix elastic#11393 (elastic#12094 )
adriansr
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