Use node v20 fetch instead of axios

Deep dependency vulnerability with Axios:
```node
axios  0.8.1 - 1.5.1
Severity: moderate
Axios Cross-Site Request Forgery Vulnerability - https://github.com/advisories/GHSA-wf5p-g6vw-rhxx
No fix available
node_modules/axios
  deep-email-validator  *
  Depends on vulnerable versions of axios
  node_modules/deep-email-validator
```