Update contributor channel name

[Gasoonjia]

rename name of. slack channel for our valuable contributors from torchchat-contribution to torchchat-contributors

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/torchchat/1354

• 📄 Preview Python docs built from this PR

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❌ 4 New Failures

As of commit aecc2ee with merge base 743e6f3 ():

NEW FAILURES - The following jobs have failed:

• pull / test-gpu-aoti-float32 (cuda, stories15M) / linux-job (gh)
  RuntimeError: cuDNN Frontend error: [cudnn_frontend] Error: No execution plans support the graph.
• pull / test-gpu-compile (cuda, stories15M) / linux-job (gh)
  RuntimeError: Command docker exec -t db0a907ac73dab7efa787c650b1591d9feada372eb1a33cd71822babf296cd81 /exec failed with exit code 1
• pull / test-gpu-eval-sanity-check (cuda, stories15M) / linux-job (gh)
  RuntimeError: cuDNN Frontend error: [cudnn_frontend] Error: No execution plans support the graph.
• Run the aoti runner with CUDA using stories / test-runner-aot-cuda / linux-job (gh)
  RuntimeError: cuDNN Frontend error: [cudnn_frontend] Error: No execution plans support the graph.

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