chore: update version to 2.4.9 and axios to 1.9.0

- Bump package version in package.json from 2.4.8 to 2.4.9
- Update axios dependency from ^1.6.7 to ^1.9.0
- Refactor makeHttpRequest function to conditionally include headers in axios config to prevent CORS preflight requests
- Add license information for Axios v1.9.0 in greip.bundle.js.LICENSE.txt
- README.md file updated

Author: gre-dev