Bump net-imap from 0.4.2 to 0.4.4

Bumps [net-imap](https://github.com/ruby/net-imap) from 0.4.2 to 0.4.4.
- [Release notes](https://github.com/ruby/net-imap/releases)
- [Commits](ruby/net-imap@v0.4.2...v0.4.4)

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

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -273,7 +273,7 @@ GEM
       connection_pool (~> 2.2)
     net-http2 (0.18.5)
       http-2 (~> 0.11)
-    net-imap (0.4.2)
+    net-imap (0.4.4)
       date
       net-protocol
     net-pop (0.1.2)