Bump serde from 1.0.199 to 1.0.200 #1027

Job	Run time
set-image	1s
clippy	15m 11s
clippy-examples (STD)	14m 47s
check (STD)	7m 57s
clippy-examples (WASM)	6m 22s
fmt	3m 4s
check (WASM)	2m 55s
check (RISCV)	3m 16s
spellcheck	1m 39s
dylint	5m 28s
test (ink)	11m 48s
build (STD)	10m 49s
test (linting)	4m 53s
build (WASM)	2m 49s
examples-custom-test	19m 6s
docs	9m 42s
examples-test (1)	9m 25s
codecov	15m 0s
examples-test (2)	14m 34s
examples-test (3)	9m 0s
examples-test (4)	15m 0s
examples-test (5)	12m 3s
examples-test (6)	9m 38s
examples-docs	5m 59s
examples-contract-build (WASM, 1)	9m 45s
examples-contract-build (WASM, 2)	10m 48s
examples-contract-build (WASM, 3)	11m 31s
examples-contract-build (WASM, 4)	8m 57s
examples-contract-build (RISCV, 1)	5m 51s
fuzz	0s
measurements / contract-sizes (master)	24m 16s
measurements / contract-sizes (pull_request)	23m 6s
	5h 4m 40s

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