Update actions/checkout action to v7 #179

Job	Run time
build (aarch64-linux, nixos-25.11)	36s
build (x86_64-linux, nixos-25.11)	9m 2s
build (x86_64-linux, nixos-unstable)	4m 56s
build (aarch64-linux, nixos-unstable)	33s
manifests-create (nixos-unstable)	6s
manifests-create (nixos-25.11)	9s
	15m 22s

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