fix requirements.txt path (microsoft#22946)

### Description

microsoft#22380 removes the file
`tools/ci_build/github/linux/docker/inference/x86_64/python/cpu/scripts/requirements.txt`
but it is still used in `dockerfiles/Dockerfile.cuda`.

This change updates the file path of the requirements.txt

fixes microsoft#22945.

dockerfiles/Dockerfile.cuda

@@ -48,7 +48,7 @@ RUN cd /code \
     && python3 -m venv /code/env \
     && . /code/env/bin/activate \
     && pip install --upgrade psutil setuptools wheel packaging \
-    && pip install -r tools/ci_build/github/linux/docker/inference/x86_64/python/cpu/scripts/requirements.txt \
+    && pip install -r /code/tools/ci_build/github/linux/python/requirements.txt \
     && python /code/tools/ci_build/build.py --build_dir /code/build/Linux \
     --allow_running_as_root --skip_submodule_sync \
     --use_cuda --cuda_home /usr/local/cuda \

docs/How_To_Update_ONNX_Dev_Notes.md

@@ -21,7 +21,7 @@ This file should be generated. See [cgmanifests/README](/cgmanifests/README.md)
 - [onnxruntime/test/python/requirements.txt](/onnxruntime/test/python/requirements.txt)
 - [tools/ci_build/github/linux/docker/scripts/requirements.txt](/tools/ci_build/github/linux/docker/scripts/requirements.txt)
 - [tools/ci_build/github/linux/docker/scripts/manylinux/requirements.txt](/tools/ci_build/github/linux/docker/scripts/manylinux/requirements.txt)
-- [tools/ci_build/github/linux/docker/inference/x86_64/python/cpu/scripts/requirements.txt](/tools/ci_build/github/linux/docker/inference/x86_64/python/cpu/scripts/requirements.txt)
+- [tools/ci_build/github/linux/python/requirements.txt](/tools/ci_build/github/linux/python/requirements.txt)
 - Run `git grep -rn "onnx==1" .` to find other locations and update this document if necessary.
 
 1. If there is any change to `cmake/external/onnx/onnx/*.in.proto`, you need to regenerate OnnxMl.cs.