Merge pull request #2535 from alphagov/dependabot/bundler/plek-5.3.1

Author: govuk-ci

Gemfile.lock

@@ -513,7 +513,7 @@ GEM
       hashery (~> 2.0)
       ruby-rc4
       ttfunk
-    plek (5.3.0)
+    plek (5.3.1)
     pp (0.6.3)
       prettyprint
     prettyprint (0.2.0)