Rust

Merge pull request #1337 from coreos/dependabot/cargo/serde-1.0.192 #2335

Job	Run time
Lints, pinned toolchain (x86_64)	2m 51s
Tests, minimum supported toolchain (x86_64)	5m 18s
Lints, pinned toolchain (s390x)	15m 11s
Tests, unstable toolchain (beta, x86_64)	2m 57s
Tests, minimum supported toolchain (s390x)	20m 32s
Docs	2m 35s
Tests, unstable toolchain (nightly, x86_64)	3m 2s
Tests, stable toolchain (x86_64)	4m 55s
Tests, stable toolchain (s390x)	19m 43s
	1h 17m 4s

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