Nix and release

Bump DeterminateSystems/nix-installer-action from 14 to 15 #405

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Run time

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Job	Run time
Build Linux (x86_64) binary	6m 9s
Build macOS (x86_64) binary	11m 34s
Build macOS (aarch64) binary	6m 51s
Create release	0s
	24m 34s