fix(deps): update serde monorepo to v1.0.204

This MR contains the following updates:

Package	Type	Update	Change
serde (source)	dependencies	patch	1.0.203 -> 1.0.204
serde_derive (source)	dependencies	patch	1.0.203 -> 1.0.204

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Release Notes

serde-rs/serde (serde)

v1.0.204

Compare Source

• Apply #[diagnostic::on_unimplemented] attribute on Rust 1.78+ to suggest adding serde derive or enabling a "serde" feature flag in dependencies (#​2767, thanks @​weiznich)

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