Protoface avatar plugin; STT anchor stays across handoff

What's Changed

• disable retry for eot errors by @chenghao-mou in https://github.com/livekit/agents/pull/6195
• chore(deps): update livekit dependency by @chenghao-mou in https://github.com/livekit/agents/pull/6194
• disable eot connection error retry too by @chenghao-mou in https://github.com/livekit/agents/pull/6196
• chore(elevenlabs): update language_code doc to remove error case by @inickt in https://github.com/livekit/agents/pull/6197
• chore(example): update otel trace example by @chenghao-mou in https://github.com/livekit/agents/pull/6178
• (xai realtime): set text modality by @tinalenguyen in https://github.com/livekit/agents/pull/6198
• fix(google): clean up STT input frame task by @gyx09212214-prog in https://github.com/livekit/agents/pull/6193
• fix(agents): keep STT input anchor on the pipeline across handoff by @chenghao-mou in https://github.com/livekit/agents/pull/6207
• chore(dep): update local-inference dep by @chenghao-mou in https://github.com/livekit/agents/pull/6214
• feat: add Protoface avatar plugin by @protoface-team in https://github.com/livekit/agents/pull/6164
• update livekit version by @chenghao-mou in https://github.com/livekit/agents/pull/6217
• Hotel Receptionist Scenario Expansion by @ShayneP in https://github.com/livekit/agents/pull/6186
• livekit-agents@1.6.4 by @github-actions[bot] in https://github.com/livekit/agents/pull/6218

New Contributors

• @gyx09212214-prog made their first contribution in https://github.com/livekit/agents/pull/6193
• @protoface-team made their first contribution in https://github.com/livekit/agents/pull/6164

Full Changelog: https://github.com/livekit/agents/compare/livekit-agents@1.6.3...livekit-agents@1.6.4