Merge pull request #599 from larskanis/update-postgres #695

Job	Run time
Build	7s
Test (windows, head, 17.0-1-windows-x64, 17)	5m 28s
Test (windows, 2.5, 9.4.26-1-windows-x64, 9.4)	6m 57s
Test (windows, mswin, 17.0-1-windows-x64, 17)	4m 42s
Test (ubuntu, head, 17)	1m 2s
Test (ubuntu, 3.2, 12)	1m 2s
Test (ubuntu, 20.04, 2.5, 9.3)	1m 32s
Test (ubuntu, truffleruby, 13)	1m 29s
Test (ubuntu, truffleruby-head, 17)	1m 55s
Test (macos, head, 17.0-1-osx, 17)	1m 17s
	25m 31s

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