Bump net-imap from 0.4.17 to 0.4.19 (#750)

Bumps [net-imap](https://github.com/ruby/net-imap) from 0.4.17 to 0.4.19.
- [Release notes](https://github.com/ruby/net-imap/releases)
- [Commits](ruby/net-imap@v0.4.17...v0.4.19)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -182,7 +182,7 @@ GEM
       sprockets (> 3.0)
       sprockets-rails
       tilt
-    date (3.3.4)
+    date (3.4.1)
     deprecation (1.1.0)
       activesupport
     descendants_tracker (0.0.4)
@@ -347,7 +347,7 @@ GEM
       bigdecimal (~> 3.1)
     multipart-post (2.4.1)
     mutex_m (0.2.0)
-    net-imap (0.4.17)
+    net-imap (0.4.19)
       date
       net-protocol
     net-pop (0.1.2)
@@ -571,7 +571,7 @@ GEM
     thor (1.3.2)
     thread_safe (0.3.6)
     tilt (2.4.0)
-    timeout (0.4.1)
+    timeout (0.4.3)
     tins (1.33.0)
       bigdecimal
       sync