Upgrade devise version for security vulnerability

Gemfile.lock

@@ -76,7 +76,7 @@ GEM
     aws-sdk-resources (2.11.96)
       aws-sdk-core (= 2.11.96)
     aws-sigv4 (1.0.3)
-    bcrypt (3.1.11)
+    bcrypt (3.1.13)
     better_errors (2.4.0)
       coderay (>= 1.0.0)
       erubi (>= 1.0.0)
@@ -136,10 +136,10 @@ GEM
     database_cleaner (1.7.0)
     decent_exposure (3.0.2)
       activesupport (>= 4.0)
-    devise (4.4.3)
+    devise (4.7.1)
       bcrypt (~> 3.0)
       orm_adapter (~> 0.1)
-      railties (>= 4.1.0, < 6.0)
+      railties (>= 4.1.0)
       responders
       warden (~> 1.2.3)
     diff-lcs (1.3)
@@ -314,9 +314,9 @@ GEM
     rb-inotify (0.9.10)
       ffi (>= 0.5.0, < 2)
     request_store (1.3.2)
-    responders (2.4.0)
-      actionpack (>= 4.2.0, < 5.3)
-      railties (>= 4.2.0, < 5.3)
+    responders (3.0.0)
+      actionpack (>= 5.0)
+      railties (>= 5.0)
     rspec (3.6.0)
       rspec-core (~> 3.6.0)
       rspec-expectations (~> 3.6.0)
@@ -411,8 +411,8 @@ GEM
     unicode-display_width (1.3.0)
     uniform_notifier (1.11.0)
     vcr (4.0.0)
-    warden (1.2.7)
-      rack (>= 1.0)
+    warden (1.2.8)
+      rack (>= 2.0.6)
     web-console (3.6.2)
       actionview (>= 5.0)
       activemodel (>= 5.0)