[CI] Pin transformers<4.53.0 and fix EPLB load_weights to make CI passed (#1482)

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

- Fix vLLM EPLB break
e9fd658a73
by recovering load_weights back to [v0.9.1
version](07b8fae219)
temporarily.

- Fix transformers>=4.53.0 image processor break
Related: https://github.com/vllm-project/vllm-ascend/issues/1470

- Mirror torch_npu requirements to pyproject.toml

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

### How was this patch tested?
CI passed

---------

Signed-off-by: MengqingCao <cmq0113@163.com>
Signed-off-by: Yikun Jiang <yikunkero@gmail.com>
Co-authored-by: Yikun Jiang <yikunkero@gmail.com>

requirements.txt

@@ -25,3 +25,6 @@ numba
 --pre
 --extra-index-url https://mirrors.huaweicloud.com/ascend/repos/pypi
 torch-npu==2.5.1.post1.dev20250619
+
+# Remove after https://github.com/vllm-project/vllm-ascend/issues/1470
+transformers<4.53.0