Update shivammathur/setup-php digest to 6ffdb3d

Author: renovate[bot]

.github/workflows/symfony.yml

@@ -21,7 +21,7 @@ jobs:
     #  To automatically get bug fixes and new Php versions for shivammathur/setup-php,
     # change this to (see https://github.com/shivammathur/setup-php#bookmark-versioning):
     # uses: shivammathur/setup-php@v2
-    - uses: shivammathur/setup-php@15b611248c3d140461e97b2eb10de461ca9ec5a3
+    - uses: shivammathur/setup-php@6ffdb3d118e94f77260a8c57171d98df7f9e25f9
       with:
         php-version: '8.3'
     - uses: actions/checkout@v4