Bump net-imap from 0.5.10 to 0.5.11 in /builder (#2796)

Bumps [net-imap](https://github.com/ruby/net-imap) from 0.5.10 to 0.5.11.
- [Release notes](https://github.com/ruby/net-imap/releases)
- [Commits](ruby/net-imap@v0.5.10...v0.5.11)

---
updated-dependencies:
- dependency-name: net-imap
  dependency-version: 0.5.11
  dependency-type: indirect
  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>

Author: dependabot[bot]

builder/Gemfile.lock

@@ -150,7 +150,7 @@ GEM
     minitest (5.25.5)
     msgpack (1.8.0)
     mutex_m (0.3.0)
-    net-imap (0.5.10)
+    net-imap (0.5.11)
       date
       net-protocol
     net-pop (0.1.2)