Rust

Merge pull request #1583 from coreos/dependabot/cargo/serde_with-3.12.0 #2845

Job	Run time
Lints, pinned toolchain (x86_64)	53s
Docs	1m 12s
Lints, pinned toolchain (s390x)	7m 3s
Tests, unstable toolchain (beta, x86_64)	2m 9s
Tests, minimum supported toolchain (x86_64)	2m 3s
Tests, unstable toolchain (nightly, x86_64)	2m 7s
Tests, minimum supported toolchain (s390x)	13m 5s
Tests, stable toolchain (x86_64)	2m 12s
Tests, stable toolchain (s390x)	12m 56s
	43m 40s

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