Bump websockets from 12.0 to 13.1 in /docker/py3-native

Bumps [websockets](https://github.com/python-websockets/websockets) from 12.0 to 13.1.
- [Release notes](https://github.com/python-websockets/websockets/releases)
- [Commits](python-websockets/websockets@12.0...13.1)

---
updated-dependencies:
- dependency-name: websockets
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>