chore(deps): update dependency net-imap to v0.5.6 [security] (#1017)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Gemfile.lock

@@ -264,7 +264,7 @@ GEM
     nenv (0.3.0)
       date
       net-protocol
-    net-imap (0.5.5)
+    net-imap (0.5.6)
       date
       net-protocol
     net-pop (0.1.2)