Bump symfony/phpunit-bridge from 6.4.4 to 6.4.7 (#285)

Bumps [symfony/phpunit-bridge](https://github.com/symfony/phpunit-bridge) from 6.4.4 to 6.4.7.
- [Release notes](https://github.com/symfony/phpunit-bridge/releases)
- [Changelog](https://github.com/symfony/phpunit-bridge/blob/7.0/CHANGELOG.md)
- [Commits](symfony/phpunit-bridge@v6.4.4...v6.4.7)

---
updated-dependencies:
- dependency-name: symfony/phpunit-bridge
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]