Bump @types/multer from 1.4.7 to 1.4.11 in /backend

Bumps [@types/multer](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/multer) from 1.4.7 to 1.4.11.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/multer)

---
updated-dependencies:
- dependency-name: "@types/multer"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

backend/package-lock.json

@@ -57,7 +57,7 @@
     "@sentry/integrations": "^7.36.0",
     "@sentry/node": "^7.36.0",
     "@sentry/tracing": "^7.36.0",
-    "@types/multer": "^1.4.7",
+    "@types/multer": "^1.4.11",
     "aws-sdk": "^2.1368.0",
     "axios": "^1.7.3",
     "cookie-parser": "^1.4.6",