Rust

Merge pull request #1601 from coreos/dependabot/cargo/rand-0.9.0 #2844

Job	Run time
Lints, pinned toolchain (x86_64)	51s
Tests, minimum supported toolchain (x86_64)	2m 26s
Lints, pinned toolchain (s390x)	7m 43s
Docs	1m 15s
Tests, minimum supported toolchain (s390x)	15m 7s
Tests, unstable toolchain (beta, x86_64)	1m 55s
Tests, unstable toolchain (nightly, x86_64)	1m 50s
Tests, stable toolchain (x86_64)	2m 3s
Tests, stable toolchain (s390x)	14m 56s
	48m 6s

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