Bump msgpack from 1.7.5 to 1.8.0 in /builder (#2599)

Bumps [msgpack](https://github.com/msgpack/msgpack-ruby) from 1.7.5 to 1.8.0.
- [Changelog](https://github.com/msgpack/msgpack-ruby/blob/master/ChangeLog)
- [Commits](msgpack/msgpack-ruby@v1.7.5...v1.8.0)

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

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

@@ -147,7 +147,7 @@ GEM
     mini_magick (4.13.2)
     mini_mime (1.1.5)
     minitest (5.25.4)
-    msgpack (1.7.5)
+    msgpack (1.8.0)
     mutex_m (0.3.0)
     net-imap (0.5.5)
       date