Bump serde from 1.0.183 to 1.0.189 #720

Job	Run time
check	6m 16s
matrix	40s
test-client-check	2m 40s
test-client-matrix	38s
test-client-clippy	3m 5s
Build test client (x86_64-unknown-linux-musl)	4m 17s
Build test client (i686-unknown-linux-musl)	3m 4s
Build test client (armv7-unknown-linux-musleabihf)	4m 11s
Build test client (aarch64-unknown-linux-musl)	3m 44s
Build test client (x86_64-unknown-freebsd)	4m 10s
Build test client (.exe, x86_64-pc-windows-gnu)	4m 40s
tests	12m 10s
clippy	6m 45s
Check MSRV	5m 45s
build (x86_64-unknown-linux-musl)	8m 28s
build (i686-unknown-linux-musl)	9m 21s
build (armv7-unknown-linux-musleabihf)	9m 19s
build (aarch64-unknown-linux-musl)	8m 56s
build (x86_64-unknown-freebsd)	8m 42s
Package nightly release	15m 18s
	2h 2m 9s

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