⬆ Bump @tanstack/router-plugin from 1.139.12 to 1.140.0 in /frontend (fastapi#2034)

Bumps [@tanstack/router-plugin](https://github.com/TanStack/router/tree/HEAD/packages/router-plugin) from 1.139.12 to 1.140.0.
- [Release notes](https://github.com/TanStack/router/releases)
- [Commits](https://github.com/TanStack/router/commits/v1.140.0/packages/router-plugin)

---
updated-dependencies:
- dependency-name: "@tanstack/router-plugin"
  dependency-version: 1.140.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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