Remove personal copyright notice from SM90 backward barriers

[jiayus-nvidia]

Before submitting

• I agree to license this contribution under the terms of LICENSE.txt.
• I ran pre-commit run and committed any formatting changes.

Affected area

FE OSS kernels or CuTeDSL

Summary

Remove the personal Jerry Chen copyright notice from
python/cudnn/deepseek_sparse_attention/utils/sm90/bwd_barriers.py.

The existing multi-author copyright notice and all executable code remain unchanged.

Why

This is a narrowly scoped licensing cleanup ahead of the repository's transition to Apache-2.0.

Related issues

None.

API and compatibility impact

None.

Testing

• git diff --check passed.
• Python AST parsing passed.
• No runtime tests were required because this is a comment-only change.
• pre-commit was not available in the local environment.

Summary by CodeRabbit

• Chores
  • Updated copyright attribution and year information.
  • No user-facing functionality or behavior changed.

[coderabbitai]

📝 Walkthrough

Walkthrough

The copyright header in bwd_barriers.py was updated with a new year and author list. No functional code or barrier definitions changed.

Changes

Copyright Header Update

Layer / File(s)	Summary
Update copyright header python/cudnn/deepseek_sparse_attention/utils/sm90/bwd_barriers.py	Replaces the existing copyright line with updated year and author information.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title accurately describes the comment-only cleanup and matches the main change in the PR.
Description check	✅ Passed	The description follows the template and includes the affected area, summary, why, issues, impact, and testing.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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_{Comment @coderabbitai help to get the list of available commands.}

[NVIDIA-JerryChen]

lgtm