Merge pull request #3307 from alphagov/dependabot/bundler/thor-1.4.0

Author: govuk-ci

Gemfile.lock

@@ -742,7 +742,7 @@ GEM
       sprockets (>= 3.0.0)
     statsd-ruby (1.5.0)
     stringio (3.1.1)
-    thor (1.3.2)
+    thor (1.4.0)
     tilt (2.4.0)
     timeout (0.4.3)
     ttfunk (1.7.0)