fix(stats): compute week/month cutoffs at call time (#13789) - #13808

On November 2, 2026, GitHub will restrict `pull_request_target` on public repositories by default. To continue allowing the event trigger, configure an Actions policy. Learn more: https://gh.io/securely-using-pull_request_target#default-policy-for-pull_request_target

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@11d5960a326750d5838078e36cf38b85af677262. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

⚠️ SECURITY WARNING: Bypassing write permission check for LalitNarayanYadav due to allowed_non_write_users='*'. This should only be used for workflows with very limited permissions.