[CI] Unpin triton in build requirements

The ROCm torch nightly 2.11.0+rocm7.14.0a20260625 bumped its triton
dependency from 3.6.x to 3.7.1, breaking the wheel build with:

  Because torch==2.11.0+rocm... depends on triton==3.7.1+... and
  you require triton==3.6.0, your requirements are unsatisfiable.

Remove the hard pin and let torch's metadata pull the matching triton
version. The constraints.txt generated by uv pip compile already
ensures a consistent torch+triton pair from the same nightly.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Signed-off-by: Marcus Rosen <marcus.rosen@amd.com>

Author: marcusr-amd

requirements/build/rocm.txt

@@ -6,7 +6,7 @@
 torch==2.11.0
 torchvision==0.26.0
 torchaudio==2.11.0
-triton==3.6.0
+triton
 cmake>=3.26.1,<4
 packaging>=24.2
 setuptools>=77.0.3,<80.0.0