deps: bump serde from 1.0.203 to 1.0.204 #1206

Job	Run time
Validate PR title	2s
Check formatting (Prettier)	3s
Build on x86_64-apple-darwin	2m 21s
Build on aarch64-apple-darwin	2m 28s
Build on x86_64-pc-windows-msvc	4m 49s
Build on x86_64-unknown-linux-gnu	2m 3s
Check rustdoc intra-doc links	2m 37s
clippy	1m 44s
rustfmt	13s
Test on x86_64-apple-darwin	1m 44s
Test on x86_64-pc-windows-msvc	3m 1s
Test on x86_64-unknown-linux-gnu	1m 4s
	22m 9s

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