build(deps): bump rustix in /contrib/nydus-backend-proxy

Bumps [rustix](https://github.com/bytecodealliance/rustix) from 0.36.8 to 0.36.16.
- [Release notes](https://github.com/bytecodealliance/rustix/releases)
- [Commits](bytecodealliance/rustix@v0.36.8...v0.36.16)

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

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