fix: add channels and conda-remove-defaults parameters in GitHub Actions workflow

Author: FabrizioMusacchio

.github/workflows/omio_tests.yml

@@ -17,6 +17,8 @@ jobs:
           activate-environment: omio
           auto-update-conda: true
           miniforge-variant: Miniforge3
+          channels: conda-forge
+          conda-remove-defaults: true
 
       - name: Install OMIO and test dependencies
         run: |