Bump phpunit/php-code-coverage from 5.2.4 to 5.3.2

Bumps [phpunit/php-code-coverage](https://github.com/sebastianbergmann/php-code-coverage) from 5.2.4 to 5.3.2.
- [Release notes](https://github.com/sebastianbergmann/php-code-coverage/releases)
- [Changelog](https://github.com/sebastianbergmann/php-code-coverage/blob/5.3.2/ChangeLog-5.3.md)
- [Commits](sebastianbergmann/php-code-coverage@5.2.4...5.3.2)

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

Author: dependabot-support