Upgrade: Bump redis from 5.0.6 to 5.0.8

Bumps [redis](https://github.com/redis/redis-rb) from 5.0.6 to 5.0.8.
- [Changelog](https://github.com/redis/redis-rb/blob/master/CHANGELOG.md)
- [Commits](redis/redis-rb@v5.0.6...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

@@ -404,9 +404,9 @@ GEM
       activesupport (>= 6.1.5)
       i18n
     redcarpet (3.6.0)
-    redis (5.0.6)
-      redis-client (>= 0.9.0)
-    redis-client (0.17.1)
+    redis (5.0.8)
+      redis-client (>= 0.17.0)
+    redis-client (0.18.0)
       connection_pool
     regexp_parser (2.8.2)
     reline (0.3.3)