Update Rust crate serde to 1.0.194

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
serde (source)	dependencies	patch	1.0.193 -> 1.0.194

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Release Notes

serde-rs/serde (serde)

### [`v1.0.194`](https://togithub.com/serde-rs/serde/releases/tag/v1.0.194) [Compare Source](https://togithub.com/serde-rs/serde/compare/v1.0.193...v1.0.194) - Update proc-macro2 to fix caching issue when using a rustc-wrapper such as sccache

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