Bump serde from 1.0.194 to 1.0.208 #2181

Job	Run time
Clippy	50s
Integration tests (macos-latest)	2m 2s
Integration tests (ubuntu-latest)	2m 9s
Rustfmt	4s
Code coverage	3m 13s
Unit tests (macos-latest, aarch64-apple-darwin, false)	2m 49s
Unit tests (macos-12, x86_64-apple-darwin, false)	3m 14s
Unit tests (windows-latest, x86_64-pc-windows-msvc, false)	5m 47s
Unit tests (ubuntu-latest, x86_64-unknown-linux-gnu, false)	2m 52s
Unit tests (ubuntu-latest, x86_64-unknown-linux-musl, true)	2m 55s
Unit tests (ubuntu-latest, i686-unknown-linux-gnu, true)	2m 58s
Unit tests (ubuntu-latest, arm-unknown-linux-gnueabihf, true)	3m 7s
Unit tests (ubuntu-latest, aarch64-unknown-linux-gnu, true)	3m 6s
	35m 6s

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