Bump msgpack from 1.1.2 to 1.2.1 (#3377)

Bumps [msgpack](https://github.com/msgpack/msgpack-python) from 1.1.2 to 1.2.1.
- [Release notes](https://github.com/msgpack/msgpack-python/releases)
- [Changelog](https://github.com/msgpack/msgpack-python/blob/main/CHANGELOG.md)
- [Commits](https://github.com/msgpack/msgpack-python/compare/v1.1.2...v1.2.1)

---
updated-dependencies:
- dependency-name: msgpack
  dependency-version: 1.2.1
  dependency-type: indirect
...

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