Bump multer from 1.4.5-lts.1 to 2.0.0 in /test-suite/client

Bumps [multer](https://github.com/expressjs/multer) from 1.4.5-lts.1 to 2.0.0.
- [Release notes](https://github.com/expressjs/multer/releases)
- [Changelog](https://github.com/expressjs/multer/blob/main/CHANGELOG.md)
- [Commits](expressjs/multer@v1.4.5-lts.1...v2.0.0)

---
updated-dependencies:
- dependency-name: multer
  dependency-version: 2.0.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

test-suite/client/package-lock.json

@@ -10,7 +10,7 @@
     "express": "^4.18.1",
     "filereader": "^0.10.3",
     "fs": "^0.0.1-security",
-    "multer": "^1.4.5-lts.1",
+    "multer": "^2.0.0",
     "multiparty": "^4.2.3",
     "nhsuk-frontend": "^6.1.0",
     "nhsuk-react-components": "^2.1.0",