Update Rust crate serde to v1.0.216

This MR contains the following updates:

Package	Type	Update	Change
serde (source)	dependencies	patch	1.0.215 -> 1.0.216

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Release Notes

serde-rs/serde (serde)

v1.0.216

Compare Source

• Mark all generated impls with #[automatically_derived] to exclude from code coverage (#​2866, #​2868, thanks @​tdittr)

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