Bump serde from 1.0.214 to 1.0.215 #1951

Job	Run time
Format	10s
Audit dependencies	24s
Clippy (x86_64-unknown-linux-gnu, false, true)	1m 1s
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-gnu)	1m 37s
Build and test (beta, ubuntu-latest, x86_64-unknown-linux-gnu)	1m 27s
Clippy (armv7-unknown-linux-gnueabihf, true, false, -target arm-linux-gnueabihf -mcpu=generic+v7a...	49s
Smoke-test fuzzing targets	3m 56s
Build and test (msrv, ubuntu-latest, x86_64-unknown-linux-gnu)	2m 3s
Smoke-test fuzzing targets (--all-features)	1m 44s
Clippy (x86_64-unknown-linux-musl, true, false, -target x86_64-linux-musl)	40s
Validate man pages	9s
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-musl)	1m 36s
Clippy (x86_64-apple-darwin, true, false, -target x86_64-macos-gnu -g)	53s
Build and test (stable, macos-latest, x86_64-apple-darwin)	2m 5s
Check unused dependencies	54s
Build and test (stable, ubuntu-latest, --all-features, x86_64-unknown-linux-gnu)	5m 51s
Validate configs	34s
Build and test (msrv, ubuntu-latest, --all-features, x86_64-unknown-linux-gnu)	2m 7s
Build and test (stable, ubuntu-latest, --all-features, x86_64-unknown-linux-musl)	1m 31s
Build and test (stable, macos-latest, --all-features, x86_64-apple-darwin)	2m 2s
	31m 33s

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