Switch to Laravel HTTP client for compatibility with Pulse, Telescope, Sentry

[Simoneu01]

The package currently uses Guzzle directly, which means requests won't appear in core tools like Pulse and Telescope. It would be great if Laravel's HTTP client could be used instead to ensure compatibility with the wider Laravel ecosystem.

It also doesn't work with things like Sentry's Laravel HTTP client integration: getsentry/sentry-laravel#797