Bump puma_worker_killer from 0.3.0 to 0.3.1
Bump puma_worker_killer from 0.3.0 to 0.3.1

Bumps [puma_worker_killer](https://github.com/schneems/puma_worker_killer) from 0.3.0 to 0.3.1.
- [Release notes](https://github.com/schneems/puma_worker_killer/releases)
- [Changelog](https://github.com/schneems/puma_worker_killer/blob/main/CHANGELOG.md)
- [Commits](https://github.com/schneems/puma_worker_killer/compare/v0.3.0...v0.3.1)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
yasslab/coderdojo.jp,yasslab/coderdojo.jp,coderdojo-japan/coderdojo.jp,coderdojo-japan/coderdojo.jp,coderdojo-japan/coderdojo.jp,yasslab/coderdojo.jp,coderdojo-japan/coderdojo.jp