Build(deps): Bump net-imap from 0.2.3 to 0.3.0 (#18407)

Bumps [net-imap](https://github.com/ruby/net-imap) from 0.2.3 to 0.3.0.
- [Release notes](https://github.com/ruby/net-imap/releases)
- [Commits](https://github.com/ruby/net-imap/compare/v0.2.3...v0.3.0)

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

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

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

Gemfile.lock

@@ -241,10 +241,8 @@ GEM
     mustache (1.1.1)
     net-http (0.2.2)
       uri
-    net-imap (0.2.3)
-      digest
+    net-imap (0.3.0)
       net-protocol
-      strscan
     net-pop (0.1.1)
       digest
       net-protocol
@@ -474,7 +472,6 @@ GEM
       sprockets (>= 3.0.0)
     sshkey (2.0.0)
     stackprof (0.2.21)
-    strscan (3.0.4)
     test-prof (1.0.10)
     thor (1.2.1)
     tilt (2.0.11)