Bump redis from 5.0.8 to 5.1.0 (#571)

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

Gemfile.lock

@@ -51,7 +51,7 @@ GEM
       racc
     racc (1.7.3)
     rainbow (3.1.1)
-    redis (5.0.8)
+    redis (5.1.0)
       redis-client (>= 0.17.0)
     redis-client (0.20.0)
       connection_pool