Rust

Merge pull request #1291 from coreos/dependabot/cargo/nix-0.27.1 #2255

Job	Run time
Docs	2m 22s
Tests, unstable toolchain (beta, x86_64)	6m 38s
Tests, unstable toolchain (nightly, x86_64)	6m 24s
Tests, minimum supported toolchain (x86_64)	3m 16s
Tests, minimum supported toolchain (s390x)	19m 9s
Lints, pinned toolchain (x86_64)	1m 44s
Lints, pinned toolchain (s390x)	11m 47s
Tests, stable toolchain (x86_64)	4m 46s
Tests, stable toolchain (s390x)	19m 16s
	1h 15m 22s

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