ui: update version of ui compile deps

ui/Gemfile.lock

@@ -1,17 +1,23 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    execjs (2.3.0)
-    json (1.8.2)
-    libv8 (3.16.14.15)
-    ref (1.0.5)
-    sass (3.4.11)
-    therubyracer (0.12.1)
-      libv8 (~> 3.16.14.0)
+    execjs (2.7.0)
+    ffi (1.9.23)
+    libv8 (3.16.14.19)
+    rb-fsevent (0.10.3)
+    rb-inotify (0.9.10)
+      ffi (>= 0.5.0, < 2)
+    ref (2.0.0)
+    sass (3.5.6)
+      sass-listen (~> 4.0.0)
+    sass-listen (4.0.0)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+    therubyracer (0.12.3)
+      libv8 (~> 3.16.14.15)
       ref
-    uglifier (2.7.0)
-      execjs (>= 0.3.0)
-      json (>= 1.8.0)
+    uglifier (4.1.9)
+      execjs (>= 0.3.0, < 3)
 
 PLATFORMS
   ruby
@@ -22,4 +28,4 @@ DEPENDENCIES
   uglifier
 
 BUNDLED WITH
-   1.12.5
+   1.16.0