chore(deps): bump concurrent-ruby from 1.3.3 to 1.3.5 in /example

Bumps [concurrent-ruby](https://github.com/ruby-concurrency/concurrent-ruby) from 1.3.3 to 1.3.5.
- [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@v1.3.3...v1.3.5)

---
updated-dependencies:
- dependency-name: concurrent-ruby
  dependency-version: 1.3.5
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

example/Gemfile.lock

@@ -65,7 +65,7 @@ GEM
       netrc (~> 0.11)
     cocoapods-try (1.2.0)
     colored2 (3.1.2)
-    concurrent-ruby (1.3.3)
+    concurrent-ruby (1.3.5)
     connection_pool (2.4.1)
     drb (2.2.1)
     escape (0.0.4)