Bumps [connection_pool](https://github.com/mperham/connection_pool) from 2.2.3 to 2.2.5.
- [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/v2.2.3...v2.2.5

)

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