Bump msgpack from 1.8.4 to 1.8.5

Bumps [msgpack](https://github.com/msgpack/msgpack-ruby) from 1.8.4 to 1.8.5.
- [Changelog](https://github.com/msgpack/msgpack-ruby/blob/master/ChangeLog)
- [Commits](https://github.com/msgpack/msgpack-ruby/compare/v1.8.4...v1.8.5)

---
updated-dependencies:
- dependency-name: msgpack
  dependency-version: 1.8.5
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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