[security] Mitigate eMudhra/emSign CA incident in dependency resolution, CI, and CLI installs : Issue #79 - #81

The strategy configuration was canceled because "test._3_12" failed

Process completed with exit code 1.

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-python@v5. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/