Api Request Recording

[SamuelMwangiW]

Use test fixtures rather than send requests to sandbox endpoint

[what-the-diff[bot]]

• The composer.json file was updated to reflect the latest versions of packages used in this project
• A new method called make() has been added to WalletBalanceRequest class which returns a request instance
• In tests, Saloon::fake is now being used instead of Orchestra\Testbench\Http\Middleware\AuthenticateSession::fake and PestPHP's mock facade methods have been replaced with MockResponse from saloon-laravel package
• Added fixtures for all the requests
• Updated tests to use fake responses from Saloon instead of real API calls
• Added a new test for the Voice API
• Fixed an issue with WebRTC token generation on sandbox accounts
• Updated tests to use Saloon instead of Mockery and GuzzleHttp\Client::request() directly