fix: Follow GitHub redirects when finding the latest version

[jbirch]

fix: Follow GitHub redirects when finding the latest version.

GitHub has started to return 301 responses when we ask for the latest version. However, this location is the one location we fail to follow redirects. We should follow their guidance (https://docs.github.com/en/rest/using-the-rest-api/best-practices-for-using-the-rest-api#follow-redirects%22)

jbirch@pitest:~ $ repo="uptime-lab/computeblade-agent"
jbirch@pitest:~ $ curl -w "Return Code: %{http_code}\n" "https://api.github.com/repos/$repo/releases/latest"
{
  "message": "Moved Permanently",
  "url": "https://api.github.com/repositories/661558995/releases/latest",
  "documentation_url": "https://docs.github.com/rest/guides/best-practices-for-using-the-rest-api#follow-redirects"
}
Return Code: 301

Fixes #35.