Update Rust crate serde_json to v1.0.121 (#47)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [serde_json](https://togithub.com/serde-rs/json) | dependencies | patch | `1.0.120` -> `1.0.121` |

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### Release Notes

<details>
<summary>serde-rs/json (serde_json)</summary>

### [`v1.0.121`](https://togithub.com/serde-rs/json/releases/tag/v1.0.121)

[Compare Source](https://togithub.com/serde-rs/json/compare/v1.0.120...v1.0.121)

-   Optimize position search in error path ([#&#8203;1160](https://togithub.com/serde-rs/json/issues/1160), thanks [@&#8203;purplesyringa](https://togithub.com/purplesyringa))

</details>

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