Your requirements could not be resolved to an installable set of packages.
Problem 1
- friendsofphp/php-cs-fixer v3.21.1 requires php ^8.0.1 -> your php version (7.3.33) does not satisfy that requirement.
- friendsofphp/php-cs-fixer[v3.15.0, ..., v3.58.1] require php ^7.4 || ^8.0 -> your php version (7.3.33) does not satisfy that requirement.
- Root composer.json requires friendsofphp/php-cs-fixer ^3.15 -> satisfiable by friendsofphp/php-cs-fixer[v3.15.0, ..., v3.58.1].