Bump redis from 5.0.7 to 5.0.8

Bumps [redis](https://github.com/redis/redis-rb) from 5.0.7 to 5.0.8.
- [Changelog](https://github.com/redis/redis-rb/blob/master/CHANGELOG.md)
- [Commits](redis/redis-rb@v5.0.7...v5.0.8)

---
updated-dependencies:
- dependency-name: redis
  dependency-type: indirect
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -257,9 +257,9 @@ GEM
     rake (13.0.6)
     rdoc (6.5.0)
       psych (>= 4.0.0)
-    redis (5.0.7)
-      redis-client (>= 0.9.0)
-    redis-client (0.17.0)
+    redis (5.0.8)
+      redis-client (>= 0.17.0)
+    redis-client (0.17.1)
       connection_pool
     reline (0.3.9)
       io-console (~> 0.5)