Update postgresql-client to v18 #1095

Job	Run time
shellcheck	5s
Obtain CTC Lock	-1s
Build heroku-26 (amd64)	3m 47s
Build heroku-22 (amd64)	4m 6s
Build heroku-24 (arm64)	3m 30s
Build heroku-26 (arm64)	3m 9s
Build heroku-24 (amd64)	3m 25s
Publish heroku-${{ matrix.stack-version }} (${{ matrix.arch }})	0s
Upload heroku-${{ matrix.stack-version }} runtime images	0s
Publish heroku-${{ matrix.stack-version }} indices	-1s
Promote heroku-${{ matrix.stack-version }} tags	0s
	18m 0s

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