docs: fix AMP disbursement link - #3619

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: pascalgn/automerge-action@7961b8b5eec56cc088c140b56d864285eabd3f67. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/