postgresql: remove version strings #135

Job	Run time
build_group1 (cgit)	9s
build_group1 (clr-installer-ci)	22s
build_group1 (golang)	8s
build_group1 (haproxy)	10s
build_group1 (httpd)	9s
build_group1 (iperf)	10s
build_group1 (machine-learning-ui)	15s
build_group1 (mariadb)	9s
build_group1 (memcached)	11s
build_group1 (mixer-ci)	14s
build_group1 (nginx)	9s
build_group1 (node)	11s
build_group1 (openjdk/8)	8s
build_group1 (openjdk/13)	10s
build_group1 (os-core)	18s
build_group1 (perl)	11s
build_group1 (php)	11s
build_group1 (php-fpm)	11s
build_group1 (postgres)	8s
build_group1 (python)	9s
build_group1 (rabbitmq)	10s
build_group1 (redis)	22s
build_group1 (ruby)	8s
	4m 23s

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