[BUILD] Upgrade torch-npu to 2.5.1 (#661)

### What this PR does / why we need it?
The torch-npu 2.5.1 are published:
https://pypi.org/project/torch-npu/2.5.1/
It's time to remove all torch-npu dev version from vllm-ascend code base

### Does this PR introduce _any_ user-facing change?
Yes, using torch-npu 2.5.1

### How was this patch tested?
- [ ] CI passed
- [ ] Manually test
- [ ] Grep all `dev2025`

---------

Signed-off-by: Yikun Jiang <yikunkero@gmail.com>

setup.py

@@ -342,11 +342,11 @@ setup(
     project_urls={
         "Homepage": "https://github.com/vllm-project/vllm-ascend",
     },
+    # TODO: Add 3.12 back when torch-npu support 3.12
     classifiers=[
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
-        "Programming Language :: Python :: 3.12",
         "License :: OSI Approved :: Apache Software License",
         "Intended Audience :: Developers",
         "Intended Audience :: Information Technology",