CryptoDungeon: correct REStake bot addresses, drop chains we no longer validate - #5197

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v3, scheduleonce/lint-filenames@v2.0.0, walbo/validate-json@v1.1.0. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/