Bump serde from 1.0.215 to 1.0.216 #8418

Job	Run time
build-linux-musl (nightly)	4m 18s
build-linux-musl (stable)	4m 7s
build-apple-x86 (nightly)	2m 29s
build-linux-arm (nightly)	7m 30s
build-linux-musl (1.70)	4m 9s
build-apple-x86 (stable)	2m 44s
build (ubuntu-latest, nightly)	3m 12s
build-linux-arm (stable)	8m 16s
build-apple-x86 (1.70)	2m 26s
build (ubuntu-latest, stable)	3m 0s
build-linux-arm (1.70)	7m 36s
Lints	36s
build (ubuntu-latest, 1.70)	3m 13s
Changelog Test	5s
build (macos-latest, nightly)	2m 53s
build (macos-latest, stable)	2m 38s
udeps	2m 18s
build (macos-latest, 1.70)	3m 20s
build (windows-latest, nightly)	7m 26s
build (windows-latest, stable)	5m 28s
build (windows-latest, 1.70)	6m 39s
	1h 24m 23s

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