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: direct:production
  update-type: version-update:semver-patch
...

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

Gemfile.lock

@@ -272,9 +272,9 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    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
     regexp_parser (2.8.1)
     request_store (1.5.1)