Bump php-coveralls/php-coveralls from 2.4.2 to 2.4.3 (#24)

Bumps [php-coveralls/php-coveralls](https://github.com/php-coveralls/php-coveralls) from 2.4.2 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@v2.4.2...v2.4.3)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]