Pull Request #137 Bump puma from 3.9.1 to 3.12.6

Bumps [puma](https://github.com/puma/puma) from 3.9.1 to 3.12.6.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](https://github.com/puma/puma/commits)

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

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