feat: add PHP 8.5 to CI test matrix

Co-authored-by: adrian05-ms <212946016+adrian05-ms@users.noreply.github.com>

Author: Copilot

.github/workflows/pr-validation.yml

@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php-versions: ['8.2', '8.3', '8.4']
+        php-versions: ['8.2', '8.3', '8.4', '8.5']
     steps:
     - name: Setup PHP
       uses: shivammathur/setup-php@v2