Merge pull request #828 from citizensadvice/dependabot/bundler/net-imap-0.6.4

Bump net-imap from 0.6.3 to 0.6.4

Author: marianayovcheva

Gemfile.lock

@@ -314,7 +314,7 @@ GEM
       uri (>= 0.11.1)
     net-http-persistent (4.0.6)
       connection_pool (~> 2.2, >= 2.2.4)
-    net-imap (0.6.3)
+    net-imap (0.6.4)
       date
       net-protocol
     net-pop (0.1.2)