chore(deps): bump axios from 1.12.0 to 1.13.5 in /backend

Bumps [axios](https://github.com/axios/axios) from 1.12.0 to 1.13.5.
- [Release notes](https://github.com/axios/axios/releases)
- [Changelog](https://github.com/axios/axios/blob/v1.x/CHANGELOG.md)
- [Commits](axios/axios@v1.12.0...v1.13.5)

---
updated-dependencies:
- dependency-name: axios
  dependency-version: 1.13.5
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

backend/package-lock.json

@@ -20,7 +20,7 @@
     "@simplewebauthn/server": "^8.3.4",
     "@types/multer": "^1.4.12",
     "@types/uuid": "^10.0.0",
-    "axios": "^1.12.0",
+    "axios": "^1.13.5",
     "base64url": "^3.0.1",
     "cors": "^2.8.5",
     "crypto-js": "^4.2.0",