[v0.11.0-dev][Installation] limit opencv-python-headless version to resolve numpy version conflict (#3767)

### What this PR does / why we need it?
vllm requires opencv-python-headless >= 4.11.0 which requires
(numpy<2.3.0,>=2), but vllm-ascend numpy version must be less than
2.0.0, so limit opencv-python-headless less than 4.11.0.86 will fix this
conflict.

backport of
afc58184ec

Signed-off-by: 22dimensions <waitingwind@foxmail.com>
Co-authored-by: 22dimensions <waitingwind@foxmail.com>

pyproject.toml

@@ -19,6 +19,7 @@ requires = [
     "msgpack",
     "quart",
     "numba",
+    "opencv-python-headless<=4.11.0.86", # Required to avoid numpy version conflict with vllm
 ]
 build-backend = "setuptools.build_meta"
 

requirements.txt

@@ -13,6 +13,7 @@ setuptools-scm>=8
 torch>=2.7.1
 torchvision
 wheel
+opencv-python-headless<=4.11.0.86 # Required to avoid numpy version conflict with vllm
 
 # requirements for disaggregated prefill
 msgpack