Update Rust crate serde_json to v1.0.121 (#15425)

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

---

### 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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Release Notes:

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