Update Rust crate serde_json to 1.0.94

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
serde_json	dependencies	patch	1.0.93 -> 1.0.94

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Release Notes

serde-rs/json

### [`v1.0.94`](https://togithub.com/serde-rs/json/releases/tag/v1.0.94) [Compare Source](https://togithub.com/serde-rs/json/compare/v1.0.93...v1.0.94) - Fix message duplication between serde_json::Error's `Display` and `source()` ([#​991](https://togithub.com/serde-rs/json/issues/991), [#​992](https://togithub.com/serde-rs/json/issues/992))

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