issue-27 -- fix 8 security vulnerabilities - #28

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: HaaLeo/publish-vscode-extension@v2. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/