Add PHP 8.5 to test matrix

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: freekmurze

.github/workflows/run-tests.yml

@@ -8,7 +8,7 @@ jobs:
         strategy:
             fail-fast: false
             matrix:
-                php: ['8.4', '8.3', '8.2', '8.1']
+                php: ['8.5', '8.4', '8.3', '8.2', '8.1']
                 dependency-version: [prefer-lowest, prefer-stable]
                 os: [ubuntu-latest]