Bump serde from 1.0.204 to 1.0.209 (#625) #170

Job	Run time
set-image	1s
fmt	1m 2s
checks	1m 25s
clippy	1m 29s
bench-rust-nightly (bit-vec)	18m 51s
miri (bit-vec)	22m 1s
bench-rust-nightly (bytes)	17m 2s
tests	3m 2s
miri (bytes)	3m 32s
bench-rust-nightly (generic-array)	16m 54s
miri (generic-array)	3m 35s
bench-rust-nightly (derive)	17m 25s
miri (arbitrary)	3m 5s
bench-rust-nightly (max-encoded-len)	17m 21s
build-linux-ubuntu-amd64	1m 17s
publish-dry-run	1m 6s
	2h 9m 8s

Provide feedback