Full PHP 8.4 compatibility

The effort here is to fully support php 8.4 and get rid of deprecation warnings.

Changed

• Upgraded PHPUnit from ^9 to ^10.0 for better PHP 8.4 compatibility
• Updated PHPDoc type annotations to match actual method signatures
• Fixed all implicit nullable parameter deprecation warnings in PHP 8.4

Fixed

• Resolved 20+ PHP 8.4 deprecation warnings related to implicit nullable parameters
• Fixed PHPStan static analysis issues with type mismatches
• Corrected return type declaration for processRestRequest() method

Technical Details

• Updated PostmarkAdminClient.php - Fixed 15+ method parameters with explicit nullable types
• Updated PostmarkAttachment.php - Fixed constructor and static method parameters
• Updated WebhookConfiguration.php and WebhookConfigurationTriggers.php - Fixed nullable parameters
• Updated various model classes with proper nullable type declarations
• All tests pass on PHP 8.1, 8.2, 8.3, and 8.4
• Zero deprecation warnings on PHP 8.4

Upgrade Warning

• Many nullable updates for methods. There is a chance this will create work
  • Changed from implicit nullable (string $name = null) to explicit nullable (?string $name = null)
• PHP Version: May require PHP 8.1+ (older versions may not be compatible)

Full Changelog: v6.1.0...v7.0.0* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *