Merge pull request #421 from openstax/dependabot/bundler/net-imap-0.5.7

Bump net-imap from 0.5.6 to 0.5.7

Author: Dantemss

Gemfile.lock

@@ -271,7 +271,7 @@ GEM
       bigdecimal (~> 3.1)
     net-http (0.6.0)
       uri
-    net-imap (0.5.6)
+    net-imap (0.5.7)
       date
       net-protocol
     net-pop (0.1.2)