Bumps the snakebridge dependency from 0.15.1 to 0.16.0 (snakepit 0.12.0 to
0.13.0) and regenerates all vLLM bindings.

Key changes in this update:
- Upgraded SnakeBridge from 0.15.1 to 0.16.0
- Upgraded Snakepit from 0.12.0 to 0.13.0
- Regenerated all vLLM wrapper modules with SnakeBridge v0.16.0
- Regenerated snakebridge.lock, registry.json, and coverage reports
- Updated mix.lock with latest dependency versions (credo 1.7.16,
  ex_doc 0.40.1, plug_cowboy 2.8.0)