chore(deps-dev): bump msgpack in the pip group across 1 directory

Bumps the pip group with 1 update in the / directory: [msgpack](https://github.com/msgpack/msgpack-python).


Updates `msgpack` 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](msgpack/msgpack-python@v1.1.2...v1.2.1)

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

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Author: dependabot[bot]