Build(deps): Bump net-imap from 0.3.7 to 0.4.0 (#23779)

Bumps [net-imap](https://github.com/ruby/net-imap) from 0.3.7 to 0.4.0.
- [Release notes](https://github.com/ruby/net-imap/releases)
- [Commits](https://github.com/ruby/net-imap/compare/v0.3.7...v0.4.0)

---
updated-dependencies:
- dependency-name: net-imap
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -248,7 +248,7 @@ GEM
     mustache (1.1.1)
     net-http (0.3.2)
       uri
-    net-imap (0.3.7)
+    net-imap (0.4.0)
       date
       net-protocol
     net-pop (0.1.2)