Gem: Update devise to v4.7.1

Fixes security issues:
- https://nvd.nist.gov/vuln/detail/CVE-2019-16109
- heartcombo/devise#4981

Gemfile.lock

@@ -79,7 +79,7 @@ GEM
     arel (9.0.0)
     autoprefixer-rails (9.3.1)
       execjs
-    bcrypt (3.1.12)
+    bcrypt (3.1.13)
     bindex (0.5.0)
     blazer (1.9.0)
       activerecord (>= 4)
@@ -165,10 +165,10 @@ GEM
       activerecord (>= 3.0, < 5.3)
       delayed_job (>= 3.0, < 5)
     device_detector (1.0.1)
-    devise (4.5.0)
+    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)
@@ -399,9 +399,9 @@ GEM
       uber (< 0.2.0)
     request_store (1.4.1)
       rack (>= 1.4)
-    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)
     rest-client (2.0.2)
       http-cookie (>= 1.0.2, < 2.0)
       mime-types (>= 1.16, < 4.0)
@@ -506,8 +506,8 @@ GEM
     url (0.3.2)
     user_agent_parser (2.5.0)
     vcr (4.0.0)
-    warden (1.2.7)
-      rack (>= 1.0)
+    warden (1.2.8)
+      rack (>= 2.0.6)
     web-console (3.7.0)
       actionview (>= 5.0)
       activemodel (>= 5.0)
@@ -590,4 +590,4 @@ DEPENDENCIES
   webmock (~> 3.3)
 
 BUNDLED WITH
-   1.16.1
+   1.16.6