Bump redis from 4.7.1 to 5.0.7

Bumps [redis](https://github.com/redis/redis-rb) from 4.7.1 to 5.0.7.
- [Changelog](https://github.com/redis/redis-rb/blob/master/CHANGELOG.md)
- [Commits](redis/redis-rb@v4.7.1...v5.0.7)

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

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

Gemfile.lock

@@ -2,6 +2,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     backports (3.24.1)
+    connection_pool (2.4.1)
     daemons (1.4.1)
     daru (0.3)
       packable (~> 1.3.13)
@@ -28,7 +29,10 @@ GEM
     rack-ssl-enforcer (0.2.9)
     rack-test (2.1.0)
       rack (>= 1.3)
-    redis (4.7.1)
+    redis (5.0.7)
+      redis-client (>= 0.9.0)
+    redis-client (0.15.0)
+      connection_pool
     rexml (3.2.5)
     ruby2_keywords (0.0.5)
     secure_headers (6.5.0)