Upgrade vLLM version to v0.9.2 (#1652)

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

This patch upgrade vLLM version to v0.9.2, this patch didn't remove the
v0.9.1 compatible code to easy review.

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

### How was this patch tested?

- vLLM version: v0.9.1
- vLLM main:
14601f5fba
- Accuracy test with 0.9.2:
https://github.com/vllm-project/vllm-ascend/actions/runs/16121612087

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

.github/workflows/vllm_ascend_test_long_term.yaml

@@ -43,7 +43,7 @@ jobs:
       max-parallel: 2
       matrix:
         os: [linux-arm64-npu-1, linux-arm64-npu-4]
-        vllm_version: [main, v0.9.1]
+        vllm_version: [main, v0.9.2]
     name: vLLM Ascend long term test
     runs-on: ${{ matrix.os }}
     container: