Reintroduce ghostscript for heroku-24 (#324) #441

Job	Run time
Obtain CTC Lock	0s
shellcheck	3s
Build heroku-20 (amd64)	4m 6s
Build heroku-22 (amd64)	3m 26s
Build heroku-24 (amd64)	3m 0s
Build heroku-24 (arm64)	2m 21s
Publish heroku-20 (amd64)	2m 24s
Upload heroku-${{ matrix.stack-version }} runtime images	0s
Publish heroku-22 (amd64)	2m 22s
Publish heroku-24 (amd64)	1m 40s
Publish heroku-24 (arm64)	1m 51s
Publish heroku-24 indices	7s
Promote heroku-${{ matrix.stack-version }} tags	0s
	21m 20s

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