Merge branch 'sh-bump-redis-store' into 'master'

Bump redis-store to 1.6.0

See merge request gitlab-org/gitlab-ce!22963

Gemfile.lock

@@ -678,7 +678,7 @@ GEM
       redis-actionpack (>= 5.0, < 6)
       redis-activesupport (>= 5.0, < 6)
       redis-store (>= 1.2, < 2)
-    redis-store (1.4.1)
+    redis-store (1.6.0)
       redis (>= 2.2, < 5)
     regexp_parser (0.5.0)
     representable (3.0.4)

Gemfile.rails5.lock

@@ -687,7 +687,7 @@ GEM
       redis-actionpack (>= 5.0, < 6)
       redis-activesupport (>= 5.0, < 6)
       redis-store (>= 1.2, < 2)
-    redis-store (1.4.1)
+    redis-store (1.6.0)
       redis (>= 2.2, < 5)
     regexp_parser (0.5.0)
     representable (3.0.4)