Update net-imap to version 0.5.14

Author: depfu[bot]

Gemfile.lock

@@ -226,7 +226,7 @@ GEM
     mutex_m (0.3.0)
     mysql2 (0.5.7)
       bigdecimal
-    net-imap (0.5.7)
+    net-imap (0.5.14)
       date
       net-protocol
     net-pop (0.1.2)
@@ -427,7 +427,7 @@ GEM
     thor (1.5.0)
     tilt (2.6.1)
     timecop (0.9.11)
-    timeout (0.6.0)
+    timeout (0.6.1)
     tins (1.38.0)
       bigdecimal
       sync