Bump phpunit/phpunit in /install/deb/filemanager/filegator (hestiacp#2892)

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 8.5.27 to 8.5.29.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/main/ChangeLog-8.5.md)
- [Commits](sebastianbergmann/phpunit@8.5.27...8.5.29)

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

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]