Bump cachix/install-nix-action from V27 to 29 #1101

Job	Run time
nix-generator	1m 43s
nix-sdist	2m 11s
nix ("ghc810")	2m 44s
cabal (8.10, ubuntu-latest)	2m 9s
nix ("ghc90")	4m 5s
nix-shell-profiling	1m 41s
cabal (8.10, macOS-latest)	5m 5s
shellcheck	8s
nix ("ghc92")	2m 30s
cabal (8.10, windows-latest)	5m 25s
cabal (9.0, ubuntu-latest)	2m 9s
stack (ubuntu-latest, --flag vulkan:generic-instances --flag VulkanMemoryAllocator:generic-instan...	2m 25s
cabal (9.0, macOS-latest)	4m 1s
stack (macOS-latest, --flag vulkan:generic-instances --flag VulkanMemoryAllocator:generic-instanc...	5m 40s
cabal (9.0, windows-latest)	5m 28s
stack (windows-latest, --flag vulkan:generic-instances --flag VulkanMemoryAllocator:generic-insta...	3m 53s
cabal (9.2, ubuntu-latest)	2m 21s
cabal (9.2, macOS-latest)	3m 56s
cabal (9.2, windows-latest)	5m 7s
	1h 2m 41s

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