chore: bump up sinon version to v20 (#11338)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [sinon](https://sinonjs.org/) ([source](https://redirect.github.com/sinonjs/sinon)) | [`^19.0.2` -> `^20.0.0`](https://renovatebot.com/diffs/npm/sinon/19.0.5/20.0.0) | [![age](https://developer.mend.io/api/mc/badges/age/npm/sinon/20.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/sinon/20.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/sinon/19.0.5/20.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/sinon/19.0.5/20.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>sinonjs/sinon (sinon)</summary>

### [`v20.0.0`](https://redirect.github.com/sinonjs/sinon/blob/HEAD/CHANGES.md#2000)

[Compare Source](https://redirect.github.com/sinonjs/sinon/compare/v19.0.5...v20.0.0)

-   [`b6daed26`](b6daed26cd)
    chore!: remove usingPromise (Morgan Roderick)
    > Everyone should be using native promises by now, or should know how to stub natives
-   [`95d4b8fc`](95d4b8fc89)
    chore!: remove fakeXMLHttpRequest and fakeServer (Morgan Roderick)
    > BREAKING CHANGE: remove fakeXMLHttpRequest and fakeServer from the API

*Released by Morgan Roderick on 2025-03-24.*

</details>

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packages/backend/server/package.json

@@ -140,7 +140,7 @@
     "cross-env": "^7.0.3",
     "nodemon": "^3.1.7",
     "react-email": "4.0.2",
-    "sinon": "^19.0.2",
+    "sinon": "^20.0.0",
     "supertest": "^7.0.0",
     "why-is-node-running": "^3.2.2"
   },