[rocm7.1_internal_testing] remove git commit in triton repo (#2500)

Validation:
http://rocm-ci.amd.com/job/mainline-pytorch2.8-manylinux-wheels-k8/9/
Relates to ROCm/builder#90 and
https://github.com/ROCm/triton/pull/866/commits
Because of
https://github.com/ROCm/triton/blob/pytorch/rocm7.1_internal_testing/setup.py#L779
```
[2025-08-12T22:08:53.385Z]         ###################

[2025-08-12T22:08:53.385Z]         # Invalid version #

[2025-08-12T22:08:53.385Z]         ###################

[2025-08-12T22:08:53.385Z]         '3.4.0+gitb2c0ea43+rocm7.1.0.gitb2c0ea43' is not valid according to PEP 440.

[2025-08-12T22:08:53.385Z] 

[2025-08-12T22:08:53.385Z]         Please make sure specify a valid version for your package.

[2025-08-12T22:08:53.385Z]         Also note that future releases of setuptools may halt the build process

[2025-08-12T22:08:53.385Z]         if an invalid version is given.
```
And
`TRITON_VERSION = "3.4.0" + get_git_version_suffix() +
os.environ.get("TRITON_WHEEL_VERSION_SUFFIX", "")`

Author: ethanwee1

.ci/docker/ci_commit_pins/triton.txt

@@ -1 +1 @@
-b2c0ea435ece3491b2940af7c08d42974b953e06
+03ec239f89bef9c314ed836731f5af60dc27da31