Bump serde from 1.0.194 to 1.0.210 #2221

Job	Run time
Clippy	54s
Integration tests (macos-latest)	1m 55s
Unit tests (macos-latest, aarch64-apple-darwin, false)	2m 17s
Integration tests (ubuntu-latest)	2m 12s
Unit tests (macos-12, x86_64-apple-darwin, false)	3m 28s
Unit tests (windows-latest, x86_64-pc-windows-msvc, false)	5m 57s
Unit tests (ubuntu-latest, x86_64-unknown-linux-gnu, false)	3m 1s
Code coverage	3m 13s
Unit tests (ubuntu-latest, x86_64-unknown-linux-musl, true)	3m 13s
Rustfmt	17s
Unit tests (ubuntu-latest, i686-unknown-linux-gnu, true)	3m 4s
Unit tests (ubuntu-latest, arm-unknown-linux-gnueabihf, true)	3m 13s
Unit tests (ubuntu-latest, aarch64-unknown-linux-gnu, true)	3m 10s
	35m 54s

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