fix: replace stale /submissions?contributor= endpoint with GET /api/v1/me/submissions (Closes #387) [FaaFyfxR9WAQrL7FcAgEHJvztd8cVMxvjHRS55rw1nwH] - #525

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/