fix(deps): update rust crate serde to v1.0.206

This MR contains the following updates:

Package	Type	Update	Change
serde (source)	dependencies	patch	1.0.205 -> 1.0.206

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Release Notes

serde-rs/serde (serde)

v1.0.206

Compare Source

• Improve support for flatten attribute inside of enums (#​2567, thanks @​Mingun)

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