Bump rustls in /tutorials/websocket_tutorial/draw_cube_rust (#240)

Bumps [rustls](https://github.com/rustls/rustls) from 0.21.7 to 0.21.11.
- [Release notes](https://github.com/rustls/rustls/releases)
- [Changelog](https://github.com/rustls/rustls/blob/main/CHANGELOG.md)
- [Commits](rustls/rustls@v/0.21.7...v/0.21.11)

---
updated-dependencies:
- dependency-name: rustls
  dependency-type: indirect
...

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