ci: Use composer action

Author: exaby73

.github/workflows/tests.yml

@@ -28,11 +28,10 @@ jobs:
         with:
           php-version: ${{ matrix.php }}
 
-      - name: Install symfony/flex
-        run: composer global require --no-progress --no-scripts --no-plugins symfony/flex
-
-      - name: Composer update on php ${{ matrix.php }} and symfony ${{ matrix.sf_version }}
-        run: export SYMFONY_REQUIRE=${{ matrix.sf_version }} composer update --prefer-dist --no-progress
+      - name: Install dependencies
+        uses: php-actions/composer@v6
+        with:
+          command: export SYMFONY_REQUIRE=${{ matrix.sf_version }} composer update
 
       - uses: php-actions/phpunit@v3
         with: