Update decidim version to revision 4315d47 (#492)

* Update decidim version to revision 3ac5766

* Update decidim version to revision 4315d47

Gemfile.lock

@@ -1,6 +1,6 @@
 GIT
   remote: https://github.com/AjuntamentdeBarcelona/decidim
-  revision: e201f49d31f4a4cb41b5b987f812db99f61736a4
+  revision: 4315d472baeb5afa100909ce55b89b1d3bc8c5b1
   branch: release/0.27-stable-bcn
   specs:
     decidim (0.27.4)
@@ -397,7 +397,7 @@ GEM
       actionpack (>= 5.0)
       cells (>= 4.1.6, < 5.0.0)
     charlock_holmes (0.7.7)
-    chef-utils (18.2.7)
+    chef-utils (18.3.0)
       concurrent-ruby
     childprocess (4.1.0)
     codecov (0.6.0)
@@ -560,7 +560,7 @@ GEM
       rails-i18n
       rainbow (>= 2.2.2, < 4.0)
       terminal-table (>= 1.5.1)
-    icalendar (2.8.0)
+    icalendar (2.9.0)
       ice_cube (~> 0.16)
     ice_cube (0.16.4)
     ice_nine (0.11.2)
@@ -947,7 +947,7 @@ GEM
       activemodel (>= 6.0.0)
       bindex (>= 0.4.0)
       railties (>= 6.0.0)
-    webmock (3.18.1)
+    webmock (3.19.1)
       addressable (>= 2.8.0)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)