Bump api-clients/test-utilities from 5.2.0 to 5.2.1

Bumps [api-clients/test-utilities](https://github.com/php-api-clients/test-utilities) from 5.2.0 to 5.2.1.
- [Release notes](https://github.com/php-api-clients/test-utilities/releases)
- [Commits](php-api-clients/test-utilities@5.2.0...5.2.1)

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

Author: dependabot-support