Fix CI failure due to using wrong version of PHP

Author: cs278

.github/workflows/main.yml

@@ -50,4 +50,4 @@ jobs:
         run: docker compose -f docker-compose.yml run test_runner vendor/bin/phpunit --no-progress --testsuite Structure
 
       - name: run cs fixer
-        run:  docker run --rm -v .:/opt/project -w /opt/project php:8.3-cli sh -c 'curl -sS https://getcomposer.org/installer | php && php composer.phar run cs'
+        run:  docker run --rm -v .:/opt/project -w /opt/project php:8.4-cli sh -c 'curl -sS https://getcomposer.org/installer | php && php composer.phar run cs'