conda classic solver

Author: Noelle Cheng

.github/workflows/linting_and_testing.yml

@@ -34,9 +34,9 @@ jobs:
       - name: Install dependencies
         run: |
             conda update -n base -c defaults conda -y 
-            conda install -n base conda-libmamba-solver -c conda-forge -y
+            # conda install -n base conda-libmamba-solver -c conda-forge -y
             conda install -c conda-forge gdal -y
-            conda install -c conda-forge -c loop3d --file dependencies.txt -y
+            conda install -c conda-forge -c loop3d --file dependencies.txt -y --solver=classic
             conda install pytest -y
 
       - name: Install map2loop