chore(deps): bump serde from 1.0.204 to 1.0.209 #4115

Job	Run time
check	32s
check no_std	27s
check serde	44s
check no_std optimism	20s
clippy	1m 19s
check std	17s
docs	1m 13s
fmt	9s
TyposCheck	6s
test stable --no-default-features	1m 28s
test stable	1m 37s
test stable --all-features	1m 55s
test beta --no-default-features	1m 35s
test beta	1m 41s
test beta --all-features	7m 46s
test nightly --no-default-features	22m 9s
test nightly	1m 38s
test nightly --all-features	1m 40s
	46m 36s

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