build(deps): bump concurrent-ruby from 1.2.2 to 1.2.3

Bumps [concurrent-ruby](https://github.com/ruby-concurrency/concurrent-ruby) from 1.2.2 to 1.2.3.
- [Release notes](https://github.com/ruby-concurrency/concurrent-ruby/releases)
- [Changelog](https://github.com/ruby-concurrency/concurrent-ruby/blob/master/CHANGELOG.md)
- [Commits](ruby-concurrency/concurrent-ruby@v1.2.2...v1.2.3)

---
updated-dependencies:
- dependency-name: concurrent-ruby
  dependency-type: indirect
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -5,7 +5,7 @@ GEM
  public_suffix (>= 2.0.2, < 6.0)
  colorator (1.1.0)
  commonmarker (0.23.10)
- concurrent-ruby (1.2.2)
+ concurrent-ruby (1.2.3)
  em-websocket (0.5.3)
  eventmachine (>= 0.12.9)
  http_parser.rb (~> 0)