Bump torch version to 2.7.1 (#1562)

### What this PR does / why we need it?
Bump torch version to 2.7.1, and cleanup infer schema patch
https://github.com/vllm-project/vllm-ascend/commit/857f489
(https://github.com/vllm-project/vllm-ascend/pull/837), this patch
depends on also: https://github.com/vllm-project/vllm-ascend/pull/1974

### Does this PR introduce any user-facing change?
No

#### How was this patch tested?
CI passed

torch-npu 2.7.1rc1 install guide:
https://gitee.com/ascend/pytorch/tree/v2.7.1/
install depending:
```
pip3 install pyyaml
pip3 install setuptools
```
install torch-npu:

Closes: https://github.com/vllm-project/vllm-ascend/issues/1866
Closes: https://github.com/vllm-project/vllm-ascend/issues/1390


- vLLM version: v0.10.0
- vLLM main:
9af654cc38

---------

Signed-off-by: Yikun Jiang <yikunkero@gmail.com>
Signed-off-by: leo-pony <nengjunma@outlook.com>
Co-authored-by: Yikun Jiang <yikunkero@gmail.com>

requirements.txt

@@ -10,8 +10,8 @@ pyyaml
 scipy
 setuptools>=64
 setuptools-scm>=8
-torch>=2.5.1
-torchvision<0.21.0
+torch>=2.7.1
+torchvision
 wheel
 # Remove after https://github.com/vllm-project/vllm-ascend/issues/2034
 transformers<4.54.0
@@ -26,4 +26,4 @@ numba
 # Install torch_npu
 --pre
 --extra-index-url https://mirrors.huaweicloud.com/ascend/repos/pypi
-torch-npu==2.5.1.post1.dev20250619
+torch-npu==2.7.1.dev20250724