build(deps): bump net-imap from 0.3.7 to 0.5.1

Bumps [net-imap](https://github.com/ruby/net-imap) from 0.3.7 to 0.5.1.
- [Release notes](https://github.com/ruby/net-imap/releases)
- [Commits](ruby/net-imap@v0.3.7...v0.5.1)

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

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

Gemfile.lock

@@ -135,7 +135,7 @@ GEM
       rexml
     crass (1.0.6)
     csv (3.3.0)
-    date (3.3.4)
+    date (3.4.1)
     debug (1.9.2)
       irb (~> 1.10)
       reline (>= 0.3.8)
@@ -267,7 +267,7 @@ GEM
     mysql2 (0.5.6)
     net-http (0.5.0)
       uri
-    net-imap (0.3.7)
+    net-imap (0.5.1)
       date
       net-protocol
     net-pop (0.1.2)
@@ -495,7 +495,7 @@ GEM
     thor (1.3.2)
     tilt (2.4.0)
     timecop (0.9.8)
-    timeout (0.4.1)
+    timeout (0.4.2)
     trailblazer-option (0.1.2)
     two_factor_authentication (2.2.0)
       devise