Build(deps): Bump redis-namespace from 1.8.2 to 1.9.0 (#17911)

Bumps [redis-namespace](https://github.com/resque/redis-namespace) from 1.8.2 to 1.9.0.
- [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/v1.8.2...v1.9)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -376,8 +376,8 @@ GEM
       optimist (>= 3.0.0)
     rchardet (1.8.0)
     redis (4.7.1)
-    redis-namespace (1.8.2)
-      redis (>= 3.0.4)
+    redis-namespace (1.9.0)
+      redis (>= 4)
     regexp_parser (2.5.0)
     request_store (1.5.1)
       rack (>= 1.4)