fix(php): drop unused/vulnerable dev tooling from client template - #1236

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-go@v2, ruby/setup-ruby@0cde4689ba33c09f1b890c1725572ad96751a3fc. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/