Update Rust crate serde to 1.0.198

This MR contains the following updates:

Package	Type	Update	Change
serde (source)	dependencies	patch	1.0.197 -> 1.0.198

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Release Notes

serde-rs/serde (serde)

v1.0.198

Compare Source

• Support serializing and deserializing Saturating<T> (#​2709, thanks @​jbethune)

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