Bump net-imap from 0.4.10 to 0.4.19

Bumps [net-imap](https://github.com/ruby/net-imap) from 0.4.10 to 0.4.19.
- [Release notes](https://github.com/ruby/net-imap/releases)
- [Commits](ruby/net-imap@v0.4.10...v0.4.19)

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

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -206,7 +206,7 @@ GEM
     crass (1.0.6)
     csv (3.3.0)
     dalli (3.2.3)
-    date (3.3.4)
+    date (3.4.1)
     debug_inspector (1.1.0)
     deep_merge (1.2.2)
     descendants_tracker (0.0.4)
@@ -366,7 +366,7 @@ GEM
     mysql2 (0.5.6)
     net-http (0.6.0)
       uri
-    net-imap (0.4.10)
+    net-imap (0.4.19)
       date
       net-protocol
     net-pop (0.1.2)
@@ -594,7 +594,7 @@ GEM
     thor (1.3.2)
     thread_safe (0.3.6)
     tilt (2.0.10)
-    timeout (0.4.1)
+    timeout (0.4.3)
     turbine-graph (0.1.3)
     turbo-rails (2.0.11)
       actionpack (>= 6.0.0)