Merge pull request #3628 from alphagov/dependabot/bundler/plek-5.2.1

Author: govuk-ci

Gemfile.lock

@@ -590,7 +590,7 @@ GEM
       ast (~> 2.4.1)
       racc
     parslet (2.0.0)
-    plek (5.2.0)
+    plek (5.2.1)
     pp (0.6.2)
       prettyprint
     prettyprint (0.2.0)