Merge pull request #614 from alphagov/dependabot/bundler/net-imap-0.5.7

Author: govuk-ci

Gemfile.lock

@@ -236,7 +236,7 @@ GEM
     multi_json (1.15.0)
     multi_xml (0.7.1)
       bigdecimal (~> 3.1)
-    net-imap (0.5.6)
+    net-imap (0.5.7)
       date
       net-protocol
     net-pop (0.1.2)