Run CI with different symfony/finder versions.

Author: donquixote

.github/workflows/php.yml

@@ -46,6 +46,7 @@ jobs:
       matrix:
         operating-system: [ubuntu-latest]
         php-versions: ['8.1', '8.2', '8.3', '8.4']
+        symfony: ['~6.4.0', '']
 
     steps:
       - name: Setup PHP, with composer and extensions
@@ -71,6 +72,10 @@ jobs:
 
       - uses: actions/checkout@v4
 
+      - name: "Downgrade symfony/finder"
+        if: matrix.symfony != ''
+        run: composer require --no-update symfony/finder:${{ matrix.symfony }}
+
       - name: Get composer cache directory
         run: echo COMPOSER_CACHE="$(composer config cache-files-dir)" >> "$GITHUB_ENV"