Bump redis-namespace from 1.7.0 to 1.8.0 (#14623)

Bump redis-namespace from 1.7.0 to 1.8.0 (#14623)

Bumps [redis-namespace](https://github.com/resque/redis-namespace) from 1.7.0 to 1.8.0.
- [Release notes](https://github.com/resque/redis-namespace/releases)
- [Changelog](https://github.com/resque/redis-namespace/blob/master/CHANGELOG.md)
- [Commits](https://github.com/resque/redis-namespace/compare/v1.7.0...v1.8.0)

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