Log Message:
security/ruby-rbnacl: update to 7.1.1

Update ruby-rbnacl to 7.1.1.

## [7.1.1] (2020-01-27)

- Test on Ruby 2.7 ([#208])
- Add project metadata to the gemspec ([#207])
- Resolve FFI deprecation warning ([#206])

## [7.1.0] (2019-09-07)

- Attached signature API ([#197], [#202])
- Fix the `generichash` state definition ([#200])

## [7.0.0] (2019-05-23)

- Drop support for Ruby 2.2 ([#194])

## [6.0.1] (2019-01-27)

- Add fallback `sodium_constants` for Argon2 ([#189])
- Support libsodium versions used by Heroku ([#186])
- Sealed boxes ([#184])