Fix ucx-py alpha version update for raft-dask (#1953)

#1804 missed updates for `ucx-py` to pick up alpha versioned nightlies

Authors:
  - Divye Gala (https://github.com/divyegala)

Approvers:
  - Vyas Ramasubramani (https://github.com/vyasr)
  - Ray Douglass (https://github.com/raydouglass)

URL: #1953

ci/build_wheel.sh

@@ -38,7 +38,7 @@ fi
 
 if [[ ${package_name} == "raft-dask" ]]; then
     sed -r -i "s/pylibraft==(.*)\"/pylibraft${PACKAGE_CUDA_SUFFIX}==\1${alpha_spec}\"/g" ${pyproject_file}
-    sed -i "s/ucx-py/ucx-py${PACKAGE_CUDA_SUFFIX}/g" python/raft-dask/pyproject.toml
+    sed -r -i "s/ucx-py==(.*)\"/ucx-py${PACKAGE_CUDA_SUFFIX}==\1${alpha_spec}\"/g" ${pyproject_file}
 else
     sed -r -i "s/rmm(.*)\"/rmm${PACKAGE_CUDA_SUFFIX}\1${alpha_spec}\"/g" ${pyproject_file}
 fi