Update GitHub Actions configuration

[frederikprijck]

Changes

• Removed releasing to GH Packages as we haven't done that before.
• Added registry-url to setup-node as that's required in order for the NODE_AUTH_TOKEN to be used, see
  • https://github.com/actions/setup-node/blob/main/src/main.ts#L59-L61
  • https://docs.github.com/en/actions/publishing-packages/publishing-nodejs-packages#publishing-packages-to-the-npm-registry
• Added dependabot config for npm
• Remove publish to CDN as that's not possible on GitHub Actions

Checklist

• I have read the Auth0 general contribution guidelines
• I have read the Auth0 Code of Conduct
• All code quality tools/guidelines have been run/followed