Bump redis from 5.0.8 to 5.1.0

Bumps [redis](https://github.com/redis/redis-rb) from 5.0.8 to 5.1.0.
- [Changelog](https://github.com/redis/redis-rb/blob/master/CHANGELOG.md)
- [Commits](redis/redis-rb@v5.0.8...v5.1.0)

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

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

Author: dependabot[bot]

Gemfile.lock

@@ -150,9 +150,9 @@ GEM
     rdf-xsd (3.2.1)
       rdf (~> 3.2)
       rexml (~> 3.2)
-    redis (5.0.8)
+    redis (5.1.0)
       redis-client (>= 0.17.0)
-    redis-client (0.17.1)
+    redis-client (0.19.1)
       connection_pool
     regexp_parser (2.8.2)
     rest-client (2.1.0)