Avoid --find-links. (#1583)

Avoid `pip --find-links` which can fail to install and fall back to older wheels. See rapidsai/build-planning#69 for more information.

Authors:
  - Bradley Dice (https://github.com/bdice)

Approvers:
  - James Lamb (https://github.com/jameslamb)

URL: #1583

ci/test_wheel.sh

@@ -8,6 +8,6 @@ WHEELHOUSE="${PWD}/dist/"
 RAPIDS_PY_WHEEL_NAME="rmm_${RAPIDS_PY_CUDA_SUFFIX}" rapids-download-wheels-from-s3 python "${WHEELHOUSE}"
 
 # echo to expand wildcard before adding '[extra]' requires for pip
-python -m pip install "rmm-${RAPIDS_PY_CUDA_SUFFIX}[test]>=0.0.0a0" --find-links "${WHEELHOUSE}"
+python -m pip install -v "$(echo "${WHEELHOUSE}"/rmm_${RAPIDS_PY_CUDA_SUFFIX}*.whl)[test]"
 
 python -m pytest ./python/rmm/rmm/tests