Bump net-imap from 0.5.1 to 0.5.6 (#1140)

Bumps [net-imap](https://github.com/ruby/net-imap) from 0.5.1 to 0.5.6.
- [Release notes](https://github.com/ruby/net-imap/releases)
- [Commits](ruby/net-imap@v0.5.1...v0.5.6)

---
updated-dependencies:
- dependency-name: net-imap
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Ahmad Farhat <[email protected]>

Author: dependabot[bot]

Gemfile.lock

@@ -134,7 +134,7 @@ GEM
     minitest (5.25.1)
     minitest-stub_any_instance (1.0.3)
     msgpack (1.7.0)
-    net-imap (0.5.1)
+    net-imap (0.5.6)
       date
       net-protocol
     net-pop (0.1.2)
@@ -266,7 +266,7 @@ GEM
       tty-screen (= 0.8.1)
       unicode-display_width (~> 2.2)
     thor (1.3.2)
-    timeout (0.4.2)
+    timeout (0.4.3)
     tty-screen (0.8.1)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)