Update PostgreSQL versions in PG_VERSIONS file #302

Job	Run time
prepare_pgversion_matrix	8s
push-test-images-for-dev (citusupgradetester)	1m 50s
push-test-images-for-release	0s
push-test-images-for-dev (pgupgradetester)	4m 37s
push-test-images-for-dev (stylechecker)	2m 22s
push-test-images-for-dev (extbuilder, 12.22)	1m 36s
push-test-images-for-dev (extbuilder, 13.18)	1m 48s
push-test-images-for-dev (extbuilder, 14.15)	1m 58s
push-test-images-for-dev (extbuilder, 15.10)	1m 30s
push-test-images-for-dev (extbuilder, 16.6)	1m 35s
push-test-images-for-dev (extbuilder, 17.2)	1m 36s
push-test-images-for-dev (exttester, 12.22)	4m 8s
push-test-images-for-dev (exttester, 13.18)	3m 46s
push-test-images-for-dev (exttester, 14.15)	3m 56s
push-test-images-for-dev (exttester, 15.10)	3m 45s
push-test-images-for-dev (exttester, 16.6)	3m 48s
push-test-images-for-dev (exttester, 17.2)	3m 56s
push-test-images-for-dev (failtester, 12.22)	2m 3s
push-test-images-for-dev (failtester, 13.18)	1m 57s
push-test-images-for-dev (failtester, 14.15)	2m 18s
push-test-images-for-dev (failtester, 15.10)	2m 28s
push-test-images-for-dev (failtester, 16.6)	2m 54s
push-test-images-for-dev (failtester, 17.2)	2m 4s
	56m 3s

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