Update Rust crate serde to 1.0.197

This MR contains the following updates:

Package	Type	Update	Change
serde (source)	dependencies	patch	1.0.196 -> 1.0.197

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Release Notes

serde-rs/serde (serde)

v1.0.197

Compare Source

• Fix unused_imports warnings when compiled by rustc 1.78
• Optimize code size of some Display impls (#​2697, thanks @​nyurik)

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