fix(deps): update dependency express to v4.21.2 (#392)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [express](http://expressjs.com/)
([source](https://redirect.github.com/expressjs/express)) | [`4.21.0` ->
`4.21.2`](https://renovatebot.com/diffs/npm/express/4.21.0/4.21.2) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/express/4.21.2?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/express/4.21.2?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/express/4.21.0/4.21.2?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/express/4.21.0/4.21.2?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>expressjs/express (express)</summary>

###
[`v4.21.2`](https://redirect.github.com/expressjs/express/compare/4.21.1...1faf228935aa0a13111f92c28ee795be64ce3f0f)

[Compare
Source](https://redirect.github.com/expressjs/express/compare/4.21.1...4.21.2)

###
[`v4.21.1`](https://redirect.github.com/expressjs/express/releases/tag/4.21.1)

[Compare
Source](https://redirect.github.com/expressjs/express/compare/4.21.0...4.21.1)

#### What's Changed

- Backport a fix for CVE-2024-47764 to the 4.x branch by
[@&#8203;joshbuker](https://redirect.github.com/joshbuker) in
[https://github.com/expressjs/express/pull/6029](https://redirect.github.com/expressjs/express/pull/6029)
- Release: 4.21.1 by
[@&#8203;UlisesGascon](https://redirect.github.com/UlisesGascon) in
[https://github.com/expressjs/express/pull/6031](https://redirect.github.com/expressjs/express/pull/6031)

**Full Changelog**:
expressjs/express@4.21.0...4.21.1

</details>

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package.json

@@ -56,7 +56,7 @@
     "clsx": "^1.2.1",
     "eventemitter3": "^5.0.1",
     "events": "^3.3.0",
-    "express": "4.21.0",
+    "express": "4.21.2",
     "express-validator": "^7.0.1",
     "flagsmith": "^3.21.0",
     "flagsmith-nodejs": "^3.2.0",