Bump concurrent-ruby from 1.3.5 to 1.3.7 (#33)

Bumps [concurrent-ruby](https://github.com/ruby-concurrency/concurrent-ruby) from 1.3.5 to 1.3.7.
- [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@v1.3.5...v1.3.7)

---
updated-dependencies:
- dependency-name: concurrent-ruby
  dependency-version: 1.3.7
  dependency-type: indirect
...

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Author: dependabot[bot]

Gemfile.lock

@@ -44,7 +44,7 @@ GEM
     bigdecimal (3.1.9)
     builder (3.3.0)
     coderay (1.1.3)
-    concurrent-ruby (1.3.5)
+    concurrent-ruby (1.3.7)
     connection_pool (2.5.0)
     constant_resolver (0.2.0)
     crass (1.0.6)