nix: update to rust-1.72.0 #701

Job	Run time
build-macos	2m 26s
build-linux (stable)	2m 16s
build-linux (nightly)	1m 57s
build-windows	3m 24s
cargo-deny (advisories)	38s
cargo-deny (bans licenses sources)	27s
docs	1m 35s
fmt	26s
lint	1m 20s
test-linux (stable)	6m 27s
test-linux (nightly)	6m 37s
test-macos	12m 1s
	39m 34s

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