deps: bump serde from 1.0.207 to 1.0.208 #1268

Job	Run time
Check formatting (Prettier)	4s
Build on x86_64-apple-darwin	1m 35s
Validate PR title	3s
Build on aarch64-apple-darwin	1m 28s
Build on x86_64-pc-windows-msvc	3m 46s
Build on x86_64-unknown-linux-gnu	1m 43s
clippy	1m 35s
rustfmt	13s
Test on x86_64-apple-darwin	1m 43s
Check rustdoc intra-doc links	1m 56s
Test on x86_64-pc-windows-msvc	3m 42s
Test on x86_64-unknown-linux-gnu	1m 1s
	18m 49s

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