Bump concurrent-ruby from 1.1.4 to 1.1.5 (mastodon#10242)

Bumps [concurrent-ruby](https://github.com/ruby-concurrency/concurrent-ruby) from 1.1.4 to 1.1.5.
- [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@v1.1.4...v1.1.5)

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

Author: dependabot[bot]

Gemfile.lock

@@ -148,7 +148,7 @@ GEM
     cocaine (0.5.8)
       climate_control (>= 0.0.3, < 1.0)
     coderay (1.1.2)
-    concurrent-ruby (1.1.4)
+    concurrent-ruby (1.1.5)
     connection_pool (2.2.2)
     crack (0.4.3)
       safe_yaml (~> 1.0.0)