Update phpstan.yml

Author: casperbakker

.github/workflows/phpstan.yml

@@ -19,7 +19,7 @@ jobs:
     - name: Setup PHP
       uses: shivammathur/setup-php@v2
       with:
-        php-version: 8.2
+        php-version: 8.3
         extensions: mbstring, gd, bcmath, imagick
 
     - name: Install dependencies