remove duplicated pg-harness-client
remove duplicated pg-harness-client

[skip ci]

Daniel-Diaz/stackage,jonschoning/stackage,massysett/stackage,mrkkrp/stackage,clinty/stackage,michalkonecny/stackage,iand675/stackage,stackbuilders/stackage,fpco/stackage,soenkehahn/stackage,athanclark/stackage,simonmichael/stackage,fimad/stackage,spencerjanssen/stackage,asr/stackage