Bump GHC JS to 9.12 #1144

Job	Run time
fedora37	4m 19s
arm (arm32v7)	2m 24s
freebsd (self-hosted, FreeBSD, X64, 9.4)	58s
build (ubuntu-24.04, 9.12)	3m 13s
freebsd (self-hosted, FreeBSD, X64, 9.6)	58s
i386	2m 3s
arm (arm64v8)	2m 22s
build (ubuntu-24.04, 9.10)	1m 20s
build (ubuntu-24.04, 9.8)	1m 20s
build (ubuntu-24.04, 9.6)	2m 37s
redhat-ubi9	4m 23s
build (ubuntu-24.04, 9.4)	2m 17s
build (ubuntu-24.04, 9.2)	1m 40s
build (ubuntu-24.04, 9.0)	1m 58s
build (ubuntu-24.04, 8.10)	2m 3s
build (ubuntu-24.04, 8.8)	1m 59s
build (ubuntu-24.04, 8.6)	2m 6s
build (macOS-latest, 9.12)	4m 2s
build (macOS-latest, 9.10)	3m 29s
build (macOS-latest, 9.8)	3m 25s
build (macOS-latest, 9.6)	3m 48s
build (macOS-latest, 9.4)	3m 26s
build (macOS-latest, 9.2)	2m 14s
	58m 24s

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