Update Rust crate serde to v1.0.208

This MR contains the following updates:

Package	Type	Update	Change
serde (source)	dependencies	patch	1.0.206 -> 1.0.208

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Release Notes

serde-rs/serde (serde)

v1.0.208

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• Support serializing and deserializing unit structs in a flatten field (#​2802, thanks @​jonhoo)

v1.0.207

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• Improve interactions between flatten attribute and skip_serializing/skip_deserializing (#​2795, thanks @​Mingun)

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