Replace the test_suite and support laravel 13

[kamerk22]

Version 2.0 - 2026-06-12

Added

• Support for Laravel 13.
• Test suite (PHPUnit + Orchestra Testbench) covering config, request signing, response parsing and the public API.
• GitHub Actions CI matrix across Laravel 12/13 on PHP 8.2 to 8.4.

Changed

• AWS and AmazonGiftCode now accept an optional ClientInterface, allowing the HTTP layer to be substituted (defaults to the existing cURL client, so behavior is unchanged).

Fixed

• CreateResponse and CreateBalanceResponse no longer raise an undefined-key error when Amazon returns a body without the cardInfo / availableFunds keys (for example error responses).

Removed

• Scrutinizer CI configuration (replaced by GitHub Actions).
• sempro/phpunit-pretty-print dev dependency (incompatible with PHPUnit 10+).
• Laravel 11 from the CI matrix and dev dependencies; it is past its security support window and is blocked by Composer's advisory policy. It remains installable for existing users via the illuminate/support constraint.