Fix pathfinder install

Author: mdboom

.github/workflows/test-wheel-linux.yml

@@ -284,7 +284,7 @@ jobs:
           set -euo pipefail
           pushd cuda_pathfinder
           ls -R
-          pip install --only-binary=:all: -v . --group "test-cu${TEST_CUDA_MAJOR}"
+          pip install --only-binary=:all: -v ./*.whl --group "test-cu${TEST_CUDA_MAJOR}"
           pip list
           popd