Add missing pymumble dependencies to requirements.txt

- Add protobuf (required for google.protobuf in mumble_pb2.py)
- Add pycryptodome (required for Crypto in crypto.py)
- These were lost when pymumble was integrated into the project

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

Co-Authored-By: Claude <noreply@anthropic.com>

requirements.txt

@@ -7,3 +7,5 @@ packaging
 pyradios
 opuslib==3.0.1
 numpy
+protobuf
+pycryptodome