Bump redis from 4.4.0 to 4.5.1 (#16868)

Bumps [redis](https://github.com/redis/redis-rb) from 4.4.0 to 4.5.1.
- [Release notes](https://github.com/redis/redis-rb/releases)
- [Changelog](https://github.com/redis/redis-rb/blob/master/CHANGELOG.md)
- [Commits](https://github.com/redis/redis-rb/compare/v4.4.0...v4.5.1

)

---
updated-dependencies:
- dependency-name: redis
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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