[Misc] update the dependency version of torch-npu (#50)

### What this PR does / why we need it?

This PR updates the dependency version of vllm-ascend on torch-npu, so
that the vllm-ascend can be installed in a later version environment
(like to torch-npu 2.6.0rc1),

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

### How was this patch tested?
CI Test

Signed-off-by: ji-huazhong <hzji210@gmail.com>

requirements.txt

@@ -3,4 +3,4 @@ pyyaml
 scipy
 setuptools
 setuptools-scm
-torch-npu == 2.5.1rc1
+torch-npu >= 2.5.1rc1