[bundler] Bump connection_pool from 2.5.3 to 2.5.4 (#108)

Bumps [connection_pool](https://github.com/mperham/connection_pool) from 2.5.3 to 2.5.4.
- [Changelog](https://github.com/mperham/connection_pool/blob/main/Changes.md)
- [Commits](mperham/connection_pool@v2.5.3...v2.5.4)

---
updated-dependencies:
- dependency-name: connection_pool
  dependency-version: 2.5.4
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]