chore: Bump express and @types/express in /server

Bumps [express](https://github.com/expressjs/express) and [@types/express](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/express). These dependencies needed to be updated together.

Updates `express` from 4.21.2 to 5.2.1
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/master/History.md)
- [Commits](expressjs/express@4.21.2...v5.2.1)

Updates `@types/express` from 4.17.21 to 5.0.6
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/express)

---
updated-dependencies:
- dependency-name: express
  dependency-version: 5.2.1
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: "@types/express"
  dependency-version: 5.0.6
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

server/package.json

@@ -3,7 +3,7 @@
     "@wireapp/commons": "5.4.11",
     "dotenv": "17.2.3",
     "dotenv-extended": "2.9.0",
-    "express": "4.21.2",
+    "express": "5.2.1",
     "express-hbs": "2.5.0",
     "fs-extra": "11.3.3",
     "handlebars": "4.7.7",
@@ -22,7 +22,7 @@
     "@babel/preset-env": "7.28.5",
     "@babel/preset-react": "7.28.5",
     "@types/dotenv": "8.2.3",
-    "@types/express": "4.17.21",
+    "@types/express": "5.0.6",
     "@types/form-data": "2.5.2",
     "@types/fs-extra": "11.0.4",
     "@types/helmet": "4.0.0",