Bump serde from 1.0.210 to 1.0.211 #218

Job	Run time
set-image	1s
clippy	1m 38s
bench-rust-nightly (bit-vec)	18m 16s
bench-rust-nightly (bytes)	16m 51s
checks	1m 23s
fmt	1m 4s
miri (bit-vec)	5h 50m 24s
bench-rust-nightly (generic-array)	16m 51s
miri (bytes)	3m 12s
bench-rust-nightly (derive)	16m 53s
miri (generic-array)	3m 15s
tests	3m 58s
bench-rust-nightly (max-encoded-len)	17m 0s
miri (arbitrary)	3m 30s
build-linux-ubuntu-amd64	1m 34s
publish-dry-run	1m 30s
	7h 37m 20s

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