Add `unminimize` to installed packages list for Heroku 24 #599

Job	Run time
shellcheck	4s
Obtain CTC Lock	0s
Build heroku-20 (amd64)	3m 47s
Build heroku-22 (amd64)	3m 24s
Build heroku-24 (amd64)	2m 19s
Build heroku-24 (arm64)	2m 35s
Upload heroku-${{ matrix.stack-version }} runtime images	0s
Publish heroku-${{ matrix.stack-version }} (${{ matrix.arch }})	0s
Publish heroku-${{ matrix.stack-version }} indices	0s
Promote heroku-${{ matrix.stack-version }} tags	0s
	12m 9s

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