[SECURITY] Bump net-imap from 0.4.11 to 0.4.19 (#918)

Bumps [net-imap](https://github.com/ruby/net-imap) from 0.4.11 to 0.4.19.
- [Release notes](https://github.com/ruby/net-imap/releases)
- [Commits](ruby/net-imap@v0.4.11...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>

Author: dependabot[bot]

Gemfile.lock

@@ -83,7 +83,7 @@ GEM
       rexml
     crass (1.0.6)
     csv (3.3.2)
-    date (3.3.4)
+    date (3.4.1)
     diff-lcs (1.5.1)
     docx (0.8.0)
       nokogiri (~> 1.13, >= 1.13.0)
@@ -237,7 +237,7 @@ GEM
     multipart-post (2.4.1)
     net-http (0.6.0)
       uri
-    net-imap (0.4.11)
+    net-imap (0.4.19)
       date
       net-protocol
     net-pop (0.1.2)
@@ -415,7 +415,7 @@ GEM
       rubocop-performance (~> 1.21.0)
     stringio (3.1.2)
     thor (1.3.2)
-    timeout (0.4.1)
+    timeout (0.4.3)
     treetop (1.6.12)
       polyglot (~> 0.3)
     ttfunk (1.8.0)