fix(applications): enforce one-way review state transitions - #229

Process completed with exit code 1.

AssertionError: expected 400 to be 201 // Object.is equality - Expected + Received - 201 + 400 ❯ test/routes/ngoApplications.test.ts:68:33

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-node@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/