Merge pull request #1449 from MITLibraries/renovate/rubygems-net-imap-vulnerability

Update dependency net-imap to v0.5.7 [SECURITY]

Author: JPrevost

Gemfile.lock

@@ -248,7 +248,7 @@ GEM
     mutex_m (0.3.0)
     net-http (0.6.0)
       uri
-    net-imap (0.5.6)
+    net-imap (0.5.8)
       date
       net-protocol
     net-pop (0.1.2)