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
...

Signed-off-by: dependabot[bot] <support@github.com>

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

Gemfile.lock

@@ -479,7 +479,7 @@ GEM
       link_header (~> 0.0, >= 0.0.8)
     rdf-normalize (0.4.0)
       rdf (~> 3.1)
-    redis (4.4.0)
+    redis (4.5.1)
     redis-namespace (1.8.1)
       redis (>= 3.0.4)
     regexp_parser (2.1.1)
@@ -753,7 +753,7 @@ DEPENDENCIES
   rails-i18n (~> 6.0)
   rails-settings-cached (~> 0.6)
   rdf-normalize (~> 0.4)
-  redis (~> 4.4)
+  redis (~> 4.5)
   redis-namespace (~> 1.8)
   rqrcode (~> 2.1)
   rspec-rails (~> 5.0)