[Fix] 220-django-channels-live-stt-python — pin deepgram-sdk to v6.1.1 (#174)

## Summary
- Pin `deepgram-sdk` from loose `>=4.0.0` to exact `==6.1.1` in
`requirements.txt`
- The consumer code already uses the v6 API surface
(`listen.v1.connect`, `EventType`, `ListenV1Results`, `send_media`,
`send_close_stream`), so no source changes were needed
- All tests pass with the pinned version

## Test plan
- [x] Installed dependencies with pinned SDK version
- [x] Ran `test_example.py` — all 5 tests pass
- [ ] Reviewer: confirm CI passes on this branch

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-authored-by: examples-bot <noreply@deepgram.com>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Luke Oliff <luke@lukeoliff.com>

Author: 4 people