Update pg gem to v1.6.1

Stan Hurequested to merge
sh-update-pg-1.6 into master

What does this MR do and why?

This gem now ships with precompiled native gems, which speeds deployments and avoids GDK issues when older PostgreSQL versions are removed.

Diff: https://my.diffend.io/gems/pg/1.5.9/1.6.1

Relates to gitlab-development-kit#1617 (closed)

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Edited by Stan Hu

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