Fix CI: use PHP 8.3 for coding standards job

Author: lacatoire

.github/workflows/integrate.yaml

@@ -17,7 +17,7 @@ jobs:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: '8.1'
+          php-version: '8.3'
           coverage: none
           # ✅ Extensions required for PHD
           extensions: >