build(deps): bump @nextcloud/router in /build/frontend-legacy

Bumps [@nextcloud/router](https://github.com/nextcloud-libraries/nextcloud-router) from 3.0.1 to 3.1.0.
- [Release notes](https://github.com/nextcloud-libraries/nextcloud-router/releases)
- [Changelog](https://github.com/nextcloud-libraries/nextcloud-router/blob/main/CHANGELOG.md)
- [Commits](nextcloud-libraries/nextcloud-router@v3.0.1...v3.1.0)

---
updated-dependencies:
- dependency-name: "@nextcloud/router"
  dependency-version: 3.1.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

build/frontend-legacy/package-lock.json

@@ -42,7 +42,7 @@
     "@nextcloud/moment": "^1.3.5",
     "@nextcloud/password-confirmation": "^6.0.2",
     "@nextcloud/paths": "^2.2.2",
-    "@nextcloud/router": "^3.0.1",
+    "@nextcloud/router": "^3.1.0",
     "@nextcloud/sharing": "^0.3.0",
     "@nextcloud/upload": "^1.11.0",
     "@nextcloud/vue": "^8.34.0",