Bump msgpack from 1.2.8 to 1.2.9 (#2529)
Bump msgpack from 1.2.8 to 1.2.9 (#2529)

Bumps [msgpack](https://github.com/msgpack/msgpack-ruby) from 1.2.8 to 1.2.9.
- [Release notes](https://github.com/msgpack/msgpack-ruby/releases)
- [Changelog](https://github.com/msgpack/msgpack-ruby/blob/master/ChangeLog)
- [Commits](https://github.com/msgpack/msgpack-ruby/compare/v1.2.8...v1.2.9)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
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