Bump phpunit/php-timer from 5.0.2 to 5.0.3

Bumps [phpunit/php-timer](https://github.com/sebastianbergmann/php-timer) from 5.0.2 to 5.0.3.
- [Release notes](https://github.com/sebastianbergmann/php-timer/releases)
- [Changelog](https://github.com/sebastianbergmann/php-timer/blob/master/ChangeLog.md)
- [Commits](sebastianbergmann/php-timer@5.0.2...5.0.3)

Signed-off-by: dependabot-preview[bot] <[email protected]>