Change conda build channel to defaults and conda-forge

Author: jnettels

.github/workflows/python_jobs.yml

@@ -43,7 +43,7 @@ jobs:
 
     - name: Build & install lpagg with conda
       run: |
-        conda build conda.recipe -c conda-forge
+        conda build conda.recipe -c defaults -c conda-forge
         conda install lpagg --use-local -c conda-forge
 
     - name: Build MSI installer for 'simultaneity' GUI version (Windows only)