Use ghcup action #270

Job	Run time
arm (arm32v7)	1s
i386	14s
arm (arm64v8)	1s
darwin_arm (self-hosted, macOS, ARM64, 8.10.7)	1s
build (ubuntu-latest, 8.6, 3.8.1.0)	2m 16s
darwin_arm (self-hosted, macOS, ARM64, 9.2.6)	1s
build (ubuntu-latest, 8.8, 3.8.1.0)	2m 15s
freebsd (self-hosted, FreeBSD, X64, 9.4.8)	24s
darwin_arm (self-hosted, macOS, ARM64, 9.4.4)	2m 0s
freebsd (self-hosted, FreeBSD, X64, 9.6.4)	24s
build (ubuntu-latest, 8.10, 3.8.1.0)	2m 17s
build (ubuntu-latest, 9.0, 3.8.1.0)	2m 15s
build (ubuntu-latest, 9.2, 3.8.1.0)	2m 16s
build (ubuntu-latest, 9.4, 3.8.1.0)	2m 16s
build (ubuntu-latest, 9.6, 3.8.1.0)	2m 16s
build (ubuntu-latest, 9.8, 3.8.1.0)	2m 15s
build (macos-13, 9.4, 3.8.1.0)	2m 16s
build (macos-13, 9.6, 3.8.1.0)	2m 15s
build (windows-latest, 9.4, 3.8.1.0)	2m 10s
build (windows-latest, 9.6, 3.8.1.0)	2m 6s
	29m 59s

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