updated to protocol v1.44.0

[longcw]

No description provided.

[gianpaj]

for those wondering what this means, I asked Copilot + Opus 4.5 to summarize this PR:

Summary of PR #560

This PR updates the LiveKit protocol definitions to version 1.44.0. It's primarily a protocol buffer (protobuf) synchronization update that introduces new features and makes various modifications across the SDK.

1. Text messaging support - New message types (TextMessageRequest, TextMessageResponse, PushTextRequest) for agent-server text communication

2. Data track features - New DataTrackInfo message and subscription options with target_fps

3. RTSP bridging - Added BRIDGE participant kind and BRIDGE_RTSP kind detail

4. WhatsApp enhancements - Added DisconnectReason enum for call disconnection

5. Video layer update - Added repair_ssrc field

6. PII redaction updates - Updated field markers and added redaction to additional sensitive fields