Merge pull request #2013 from alphagov/dependabot/bundler/plek-5.3.1

Author: govuk-ci

Gemfile.lock

@@ -533,7 +533,7 @@ GEM
     pg (1.6.3-aarch64-linux)
     pg (1.6.3-arm64-darwin)
     pg (1.6.3-x86_64-linux)
-    plek (5.3.0)
+    plek (5.3.1)
     pp (0.6.3)
       prettyprint
     prettyprint (0.2.0)