Update friendsofphp/php-cs-fixer requirement from 2.* to 3.*
Update friendsofphp/php-cs-fixer requirement from 2.* to 3.*

Updates the requirements on [friendsofphp/php-cs-fixer](https://github.com/FriendsOfPHP/PHP-CS-Fixer) to permit the latest version.
- [Release notes](https://github.com/FriendsOfPHP/PHP-CS-Fixer/releases)
- [Changelog](https://github.com/FriendsOfPHP/PHP-CS-Fixer/blob/master/CHANGELOG.md)
- [Commits](https://github.com/FriendsOfPHP/PHP-CS-Fixer/compare/v2.0.0...v3.2.0)

---
updated-dependencies:
- dependency-name: friendsofphp/php-cs-fixer
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
Fahl-Design/log4php-slack-appender,Fahl-Design/log4php-slack-appender