Bump connection_pool from 2.2.2 to 2.2.3 (#13960)

Bumps [connection_pool](https://github.com/mperham/connection_pool) from 2.2.2 to 2.2.3.
- [Release notes](https://github.com/mperham/connection_pool/releases)
- [Changelog](https://github.com/mperham/connection_pool/blob/master/Changes.md)
- [Commits](https://github.com/mperham/connection_pool/compare/v2.2.2...v2.2.3

)

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Gemfile.lock

@@ -166,7 +166,7 @@ GEM
       climate_control (>= 0.0.3, < 1.0)
     coderay (1.1.3)
     concurrent-ruby (1.1.6)
-    connection_pool (2.2.2)
+    connection_pool (2.2.3)
     crack (0.4.3)
       safe_yaml (~> 1.0.0)
     crass (1.0.6)