Bump net-imap from 0.4.6 to 0.4.7 (#3866)

Bumps [net-imap](https://github.com/ruby/net-imap) from 0.4.6 to 0.4.7.
- [Release notes](https://github.com/ruby/net-imap/releases)
- [Commits](ruby/net-imap@v0.4.6...v0.4.7)

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

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

Gemfile.lock

@@ -434,7 +434,7 @@ GEM
       coffee-rails (>= 3.2.1)
       jquery-rails
       rails (>= 3.2.0)
-    net-imap (0.4.6)
+    net-imap (0.4.7)
       date
       net-protocol
     net-ldap (0.18.0)