Update actions/checkout action to v6 - autoclosed #174

Job	Run time
build (x86_64-linux, nixos-unstable)	8m 3s
build (aarch64-linux, nixos-25.11)	5m 29s
build (x86_64-linux, nixos-25.11)	9m 14s
build (aarch64-linux, nixos-unstable)	5m 41s
manifests-create (nixos-25.11)	12s
manifests-create (nixos-unstable)	13s
	28m 52s

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