Safely remove python dependency from environment

.github/workflows/test_suite.yml

@@ -37,7 +37,7 @@ jobs:
       - name: Remove explicit python version from the environment
         shell: bash -l {0}
         run: |
-          sed -i '/python=.*/d' ${{ env.CONDA_ENV_FILE }}
+          sed -Ei '/^\s*-?\s*python\s*([#=].*)?$/d' ${{ env.CONDA_ENV_FILE }}
           cat  ${{ env.CONDA_ENV_FILE }}
 
       - name: Setup Mambaforge