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Bump DeterminateSystems/nix-installer-action from 14 to 15 #5821

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Run time

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Job	Run time
nix (ubuntu-latest)	19m 57s
nix (macos-14)	20m 22s
mamba (ubuntu-latest)	10m 8s
mamba (macos-14)	10m 23s
pixi (ubuntu-latest)	9m 34s
pixi (macos-14)	6m 47s
	1h 17m 11s