Bump symfony/phpunit-bridge from 3.4.31 to 3.4.32

Bumps [symfony/phpunit-bridge](https://github.com/symfony/phpunit-bridge) from 3.4.31 to 3.4.32.
- [Release notes](https://github.com/symfony/phpunit-bridge/releases)
- [Changelog](https://github.com/symfony/phpunit-bridge/blob/master/CHANGELOG.md)
- [Commits](symfony/phpunit-bridge@v3.4.31...v3.4.32)

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