Bump v0.9.1rc1 release (#1349)

### What this PR does / why we need it?
Bump v0.9.1rc1 release

Closes: https://github.com/vllm-project/vllm-ascend/pull/1341
Closes: https://github.com/vllm-project/vllm-ascend/pull/1334

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

### How was this patch tested?
CI passed


---------

Signed-off-by: Shanshan Shen <87969357+shen-shanshan@users.noreply.github.com>
Signed-off-by: Yikun Jiang <yikunkero@gmail.com>
Signed-off-by: leo-pony <nengjunma@outlook.com>
Co-authored-by: wangxiyuan <wangxiyuan1007@gmail.com>
Co-authored-by: leo-pony <nengjunma@outlook.com>
Co-authored-by: shen-shanshan <467638484@qq.com>

.github/workflows/nightly_benchmarks.yaml

@@ -51,9 +51,6 @@ jobs:
       matrix:
         include:
           - vllm_branch: v0.9.1
-            vllm_ascend_branch: main
-            vllm_use_v1: 0
-          - vllm_branch: v0.9.0
             vllm_ascend_branch: main
             vllm_use_v1: 1
       max-parallel: 1