chore: bump up sinon version to v21 (#12827)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [sinon](https://sinonjs.org/)
([source](https://redirect.github.com/sinonjs/sinon)) | [`^20.0.0` ->
`^21.0.0`](https://renovatebot.com/diffs/npm/sinon/20.0.0/21.0.0) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/sinon/21.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/sinon/21.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/sinon/20.0.0/21.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/sinon/20.0.0/21.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

###
[`v21.0.0`](https://redirect.github.com/sinonjs/sinon/blob/HEAD/CHANGES.md#2100)

[Compare
Source](https://redirect.github.com/sinonjs/sinon/compare/v20.0.0...52b0d97a0ff32888a26941325b9dc0a059fdf739)

-
[`fd10f13f`](fd10f13f3f)
chore!: remove assert.failException property
([#&#8203;2659](https://redirect.github.com/sinonjs/sinon/issues/2659))
(Morgan Roderick)
> This was used for allowing customisation of the thrown error between
> sandboxes and for customisation for integrations (most likely from the
    > days of BusterJS).
    >
> To my knowledge and what I've been able to find on GitHub, this has
    > never had any *production* use by end users.
    >
    > BREAKING CHANGE: this removes assert.failException from the API

*Released by Morgan Roderick on 2025-06-13.*

</details>

---

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packages/backend/server/package.json

@@ -147,7 +147,7 @@
     "c8": "^10.1.3",
     "nodemon": "^3.1.7",
     "react-email": "4.0.11",
-    "sinon": "^20.0.0",
+    "sinon": "^21.0.0",
     "supertest": "^7.0.0",
     "why-is-node-running": "^3.2.2"
   },

yarn.lock

@@ -1010,7 +1010,7 @@ __metadata:
     rxjs: "npm:^7.8.1"
     semver: "npm:^7.6.3"
     ses: "npm:^1.10.0"
-    sinon: "npm:^20.0.0"
+    sinon: "npm:^21.0.0"
     socket.io: "npm:^4.8.1"
     stripe: "npm:^17.4.0"
     supertest: "npm:^7.0.0"
@@ -31231,16 +31231,16 @@ __metadata:
   languageName: node
   linkType: hard
 
-"sinon@npm:^20.0.0":
-  version: 20.0.0
-  resolution: "sinon@npm:20.0.0"
+"sinon@npm:^21.0.0":
+  version: 21.0.0
+  resolution: "sinon@npm:21.0.0"
   dependencies:
     "@sinonjs/commons": "npm:^3.0.1"
     "@sinonjs/fake-timers": "npm:^13.0.5"
     "@sinonjs/samsam": "npm:^8.0.1"
     diff: "npm:^7.0.0"
     supports-color: "npm:^7.2.0"
-  checksum: 10/825cb36a58c0510cec03d9bef4fe66a12baf0e0cfdf1600423e3da1e6d57a03fe8161f4859340ea13d4c42e63da1724a260ef4c5ce119dc9ee075ad93b6e8bdd
+  checksum: 10/b460e1cde56fa34ecbebc216522667fa3985444020dc70508177f85d127e6b9a27184c4b3146c575b30ec3091bde508b1373fad306b1e808037a37035e62065d
   languageName: node
   linkType: hard