fix: allow npm consumers to install the package - #216

HttpError: Resource not accessible by integration - https://docs.github.com/rest/issues/comments#create-an-issue-comment

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020, braintrustdata/eval-action@c0dd75b29984a0cc63a827d6e8da2f23f2752be4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/