fix(blockvalidation): check difficulty of every catch-up header before fetching blocks - #2084

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache/restore@0057852bfaa89a56745cba8c7296529d2fc39830, actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955, actions/setup-go@d35c59abb061a4a6fb18e82ac0862c26744d6ab5, actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/