chore(deps): bump serde from 1.0.204 to 1.0.209 #978

Job	Run time
check	5m 3s
matrix	36s
test-client-check	2m 48s
test-client-matrix	40s
test-client-clippy	2m 20s
Build test client (x86_64-unknown-linux-musl)	2m 59s
Build test client (i686-unknown-linux-musl)	2m 53s
Build test client (armv7-unknown-linux-musleabihf)	3m 50s
Build test client (aarch64-unknown-linux-musl)	3m 27s
Build test client (x86_64-unknown-freebsd)	3m 6s
Build test client (.exe, x86_64-pc-windows-gnu)	3m 49s
tests	6m 19s
Check MSRV	4m 47s
clippy	4m 11s
build (x86_64-unknown-linux-musl)	7m 14s
build (i686-unknown-linux-musl)	6m 46s
build (armv7-unknown-linux-musleabihf)	6m 19s
build (aarch64-unknown-linux-musl)	6m 59s
build (x86_64-unknown-freebsd)	5m 46s
Package nightly release	25m 23s
	1h 45m 15s

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