upgrade torch npu version (#4433)

vLLM graph feature now rely on torch >=2.8. To make graph mode work, we
need upgrade torch version as well. For long term support, upgrade torch
to a newer one is good to go as well.

Related vLLM change: https://github.com/vllm-project/vllm/pull/25110


- vLLM version: v0.11.2
- vLLM main: https://github.com/vllm-project/vllm/commit/v0.11.2

tests/e2e/multicard/test_weight_loader.py

@@ -61,7 +61,7 @@ def test_external_launcher(model):
         stderr=subprocess.STDOUT,
         timeout=600,
     )
-    output = proc.stdout.decode()
+    output = proc.stdout.decode(errors='ignore')
 
     print(output)
 
@@ -99,7 +99,7 @@ def test_external_launcher_dense(model):
         stderr=subprocess.STDOUT,
         timeout=600,
     )
-    output = proc.stdout.decode()
+    output = proc.stdout.decode(errors='ignore')
 
     print(output)