Upgrade redis-actionpack gem

Gemfile.lock

@@ -796,9 +796,9 @@ GEM
     recaptcha (4.13.1)
       json
     recursive-open-struct (1.1.0)
-    redis (4.1.2)
-    redis-actionpack (5.0.2)
-      actionpack (>= 4.0, < 6)
+    redis (4.1.3)
+    redis-actionpack (5.1.0)
+      actionpack (>= 4.0, < 7)
       redis-rack (>= 1, < 3)
       redis-store (>= 1.1.0, < 2)
     redis-activesupport (5.0.7)
@@ -806,7 +806,7 @@ GEM
       redis-store (>= 1.3, < 2)
     redis-namespace (1.6.0)
       redis (>= 3.0.4)
-    redis-rack (2.0.5)
+    redis-rack (2.0.6)
       rack (>= 1.5, < 3)
       redis-store (>= 1.2, < 2)
     redis-rails (5.0.2)