Merge pull request #3671 from Coursemology/dependabot/bundler/uglifier-4.2.0

Bump uglifier from 4.1.20 to 4.2.0

Author: trangmei

Gemfile.lock

@@ -515,7 +515,7 @@ GEM
       railties (>= 3.1)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
-    uglifier (4.1.20)
+    uglifier (4.2.0)
       execjs (>= 0.3.0, < 3)
     unicode-display_width (1.5.0)
     uniform_notifier (1.12.1)