Bump redis-namespace from 1.8.2 to 1.9.0 (#18987)

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

Gemfile

@@ -51,7 +51,7 @@ gem 'ed25519', '~> 1.3'
 gem 'fast_blank', '~> 1.0'
 gem 'fastimage'
 gem 'hiredis', '~> 0.6'
-gem 'redis-namespace', '~> 1.8'
+gem 'redis-namespace', '~> 1.9'
 gem 'htmlentities', '~> 4.3'
 gem 'http', '~> 5.1'
 gem 'http_accept_language', '~> 2.1'

Gemfile.lock

@@ -542,8 +542,8 @@ GEM
     rdf-normalize (0.5.0)
       rdf (~> 3.2)
     redis (4.5.1)
-    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)
@@ -822,7 +822,7 @@ DEPENDENCIES
   rails-settings-cached (~> 0.6)
   rdf-normalize (~> 0.5)
   redis (~> 4.5)
-  redis-namespace (~> 1.8)
+  redis-namespace (~> 1.9)
   rexml (~> 3.2)
   rqrcode (~> 2.1)
   rspec-rails (~> 5.1)