Update build_package.yml

Fix conda command to remove all index caches

Author: MagdaJuarez

.github/workflows/build_package.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip virtualenv
-          conda clean —all
+          conda clean --all
           conda config --set verbosity 3 --env
           CONDA_BASE=$(conda info --base)
           source "${CONDA_BASE}/etc/profile.d/conda.sh"