chore: update workflow actions

[mkeithX]

Motivation

This PR updates the workflow actions in our GitHub Actions configuration to improve functionality and maintainability.

Changes:

• Upgrade actions/checkout to version 4.
• Upgrade actions/setup-node to version 4.
• fix: Adjust the deployment command to correctly use npx wrangler for deploying previews.
• refactor: Add environment variables for Cloudflare API token and account ID for better security.

Pre-flight Checklist

• [x] I have read and understand the Contributing Guidelines on Pull Request.