Bump concurrent-ruby from 1.3.7 to 1.3.8 (#306)

Bumps [concurrent-ruby](https://github.com/ruby-concurrency/concurrent-ruby) from 1.3.7 to 1.3.8.
- [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@v1.3.7...v1.3.8)

---
updated-dependencies:
- dependency-name: concurrent-ruby
  dependency-version: 1.3.8
  dependency-type: indirect
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -28,7 +28,7 @@ GEM
     ast (2.4.3)
     base64 (0.3.0)
     bigdecimal (4.1.2)
-    concurrent-ruby (1.3.7)
+    concurrent-ruby (1.3.8)
     connection_pool (3.0.2)
     diff-lcs (1.6.2)
     drb (2.2.3)
@@ -163,7 +163,7 @@ CHECKSUMS
   base64 (0.3.0) sha256=27337aeabad6ffae05c265c450490628ef3ebd4b67be58257393227588f5a97b
   bigdecimal (4.1.2) sha256=53d217666027eab4280346fba98e7d5b66baaae1b9c3c1c0ffe89d48188a3fbd
   bundler (4.0.16) sha256=d6ca5dd440c24f9abce9844cf44cc8e18c6a553de65a47efb4544137af92c47d
-  concurrent-ruby (1.3.7) sha256=4412caec3a5ea2e5fdc52076724c071a81f2c0593d83b2ac8cbb8ca63b3151b0
+  concurrent-ruby (1.3.8) sha256=b2f1be836e968ccc78ccfce277ea79c72a88633f22306782c16ff23fb415d1e1
   connection_pool (3.0.2) sha256=33fff5ba71a12d2aa26cb72b1db8bba2a1a01823559fb01d29eb74c286e62e0a
   diff-lcs (1.6.2) sha256=9ae0d2cba7d4df3075fe8cd8602a8604993efc0dfa934cff568969efb1909962
   drb (2.2.3) sha256=0b00d6fdb50995fe4a45dea13663493c841112e4068656854646f418fda13373