force install torch cpu

Author: cccclai

.ci/scripts/test_wheel_package_qnn.sh

@@ -90,6 +90,8 @@ echo "=== Building Wheel Package ==="
 # pip install torch=="2.9.0.dev20250801" --index-url "https://download.pytorch.org/whl/nightly/cpu"
 source .ci/scripts/utils.sh
 install_executorch "--use-pt-pinned-commit"
+pip uninstall -y torch
+pip install torch=="2.9.0.dev20250801" --index-url "https://download.pytorch.org/whl/nightly/cpu"
 EXECUTORCH_BUILDING_WHEEL=1 python setup.py bdist_wheel
 unset EXECUTORCH_BUILDING_WHEEL