Bump serde from 1.0.214 to 1.0.215 (#2430) #8368

Job	Run time
build-linux-arm (nightly)	7m 48s
build-apple-x86 (nightly)	2m 51s
build-linux-musl (nightly)	4m 16s
build-linux-arm (stable)	7m 29s
build (ubuntu-latest, nightly)	3m 13s
build-apple-x86 (stable)	2m 41s
build-linux-musl (stable)	4m 8s
build-linux-arm (1.70)	8m 13s
build-apple-x86 (1.70)	2m 42s
build (ubuntu-latest, stable)	2m 45s
build-linux-musl (1.70)	4m 18s
build (ubuntu-latest, 1.70)	3m 13s
Lints	3m 35s
build (macos-latest, nightly)	3m 2s
Changelog Test	4s
build (macos-latest, stable)	3m 3s
udeps	2m 13s
build (macos-latest, 1.70)	3m 6s
build (windows-latest, nightly)	25m 0s
build (windows-latest, stable)	25m 16s
build (windows-latest, 1.70)	6m 20s
	2h 5m 16s

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