Update Puma to v6.3.0

This is needed to support a new feature for encrypted SSL keys:
https://github.com/puma/puma/pull/3133

Relates to https://gitlab.com/gitlab-org/omnibus-gitlab/-/issues/7799

Diff: https://my.diffend.io/gems/puma/6.2.2/6.3.0

Changelog: changed