Bump serde from 1.0.199 to 1.0.200 #89

Job	Run time
set-image	1s
checks	2m 16s
bench-rust-nightly (bit-vec)	18m 18s
fmt	1m 32s
bench-rust-nightly (bytes)	17m 27s
clippy	2m 11s
miri (bit-vec)	53m 3s
bench-rust-nightly (generic-array)	17m 25s
miri (bytes)	3m 18s
tests	3m 31s
bench-rust-nightly (derive)	21m 22s
miri (generic-array)	3m 24s
bench-rust-nightly (max-encoded-len)	17m 27s
miri (arbitrary)	3m 48s
build-linux-ubuntu-amd64	1m 51s
publish-dry-run	2m 10s
	2h 49m 4s

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