Add PHP 8.5 to test workflow matrix (#626)

This commit adds PHP 8.5 to the GitHub Actions test workflow matrix to ensure the package is tested against the latest PHP version.

Co-authored-by: Spatie AI <ai@spatie.be>
Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: 3 people

.github/workflows/run-tests.yml

@@ -12,7 +12,7 @@ jobs:
       fail-fast: true
       matrix:
         os: [ubuntu-latest]
-        php: [8.4, 8.3, 8.2]
+        php: [8.5, 8.4, 8.3, 8.2]
         laravel: ['11.*', '12.*']
         dependency-version: [prefer-lowest, prefer-stable]