Allowing to overwrite default http/https clients

Changes:

• Dependencies are updated to latest versions.

• By using optional requests.http and requests.https configurations we allow to overwrite the internal http and https client agents implementation. Defaults: http and https.

  For example, this could be used to add support for following redirects, like so:

  ...
    requests: {
      http: require('follow-redirects/http'),
      https: require('follow-redirects/https')
    }
  ...

  If using undici or http2 this settings are ignored!