Switch to hs-nix-infra for pinning Haskell toolchain #143

Job	Run time
Build (8.10.7, 3.8, ubuntu-20.04)	11m 6s
Build (8.10.7, 3.8, ubuntu-22.04)	16m 46s
Build (8.10.7, 3.8, macOS-latest)	27m 54s
Build (9.0.2, 3.8, ubuntu-20.04)	11m 36s
Build (9.0.2, 3.8, ubuntu-22.04)	12m 31s
Build (9.0.2, 3.8, macOS-latest)	19m 46s
Build (9.2, 3.8, ubuntu-20.04)	1m 24s
Build (9.2, 3.8, ubuntu-22.04)	2m 20s
Build (9.2, 3.8, macOS-latest)	3m 2s
Build (9.4, 3.8, ubuntu-20.04)	2m 32s
Build (9.4, 3.8, ubuntu-22.04)	2m 13s
Build (9.4, 3.8, macOS-latest)	6m 22s
Build and publish docker image	0s
	1h 57m 32s

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