Bump msgpack from 1.1.2 to 1.2.1

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

---
updated-dependencies:
- dependency-name: msgpack
  dependency-version: 1.2.1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements-3.13.txt

@@ -28,7 +28,7 @@ itsdangerous==2.2.0
 Jinja2==3.1.6
 Mako==1.3.12
 MarkupSafe==3.0.3
-msgpack==1.1.2
+msgpack==1.2.1
 multipart==1.3.1
 packaging==26.2
 psycopg2==2.9.12