PHP: Remove deprectated composer --no-suggest

From Composer v2, `--no-suggest` option is removed: https://php.watch/articles/composer-2

ci/php.yml

@@ -18,7 +18,7 @@ jobs:
       run: composer validate
 
     - name: Install dependencies
-      run: composer install --prefer-dist --no-progress --no-suggest
+      run: composer install --prefer-dist --no-progress
 
     # Add a test script to composer.json, for instance: "test": "vendor/bin/phpunit"
     # Docs: https://getcomposer.org/doc/articles/scripts.md