Bump fluentd from 1.5.1 to 1.5.2
Bump fluentd from 1.5.1 to 1.5.2

Bumps [fluentd](https://github.com/fluent/fluentd) from 1.5.1 to 1.5.2.
- [Release notes](https://github.com/fluent/fluentd/releases)
- [Changelog](https://github.com/fluent/fluentd/blob/master/CHANGELOG.md)
- [Commits](https://github.com/fluent/fluentd/compare/v1.5.1...v1.5.2)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
Tomohiro/fluentular