deps: bump serde from 1.0.205 to 1.0.206 #1259

Job	Run time
Build on x86_64-apple-darwin	1m 11s
Check formatting (Prettier)	6s
Build on aarch64-apple-darwin	1m 10s
Validate PR title	8s
Build on x86_64-pc-windows-msvc	2m 54s
Build on x86_64-unknown-linux-gnu	1m 33s
Check rustdoc intra-doc links	1m 40s
Test on x86_64-apple-darwin	1m 35s
rustfmt	19s
clippy	1m 47s
Test on x86_64-pc-windows-msvc	4m 13s
Test on x86_64-unknown-linux-gnu	1m 25s
	18m 1s

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