Update python-app-conda.yml

.github/workflows/python-app-conda.yml

@@ -26,11 +26,13 @@ jobs:
         # $CONDA is an environment variable pointing to the root of the miniconda directory
         echo $CONDA/bin >> $GITHUB_PATH
         conda --version
-    - name: Change conda version
+    - name: Change conda version and set channels
       run: |
         # RB: Bug in the most recent version (24.1.2)
         conda install conda=23.11.0 python=3.11
         conda --version
+        conda config --remove channels defaults
+        conda config --add channels conda-forge
     - name: Install dependencies
       run: |
         conda env update --file environment.yml --name base