Bump capistrano from 3.14.1 to 3.15.0 (#15537)

* Bump capistrano from 3.14.1 to 3.15.0

Bumps [capistrano](https://github.com/capistrano/capistrano) from 3.14.1 to 3.15.0.
- [Release notes](https://github.com/capistrano/capistrano/releases)
- [Commits](https://github.com/capistrano/capistrano/compare/v3.14.1...v3.15.0

)

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

* Fix config/deploy.rb

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Yamagishi Kazutoshi <ykzts@desire.sh>