Bump phpunit/phpunit in the composer group across 1 directory

Bumps the composer group with 1 update in the / directory: [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit).


Updates `phpunit/phpunit` from 8.5.29 to 8.5.52
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/8.5.52/ChangeLog-8.5.md)
- [Commits](sebastianbergmann/phpunit@8.5.29...8.5.52)

---
updated-dependencies:
- dependency-name: phpunit/phpunit
  dependency-version: 8.5.52
  dependency-type: direct:development
  dependency-group: composer
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]