Bump php-coveralls/php-coveralls from 2.1.0 to 2.4.3

Bumps [php-coveralls/php-coveralls](https://github.com/php-coveralls/php-coveralls) from 2.1.0 to 2.4.3.
- [Release notes](https://github.com/php-coveralls/php-coveralls/releases)
- [Changelog](https://github.com/php-coveralls/php-coveralls/blob/master/CHANGELOG.md)
- [Commits](php-coveralls/php-coveralls@v2.1.0...v2.4.3)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>