Update testing_in_conda.yml

Author: kujaku11

.github/workflows/testing_in_conda.yml

@@ -34,7 +34,7 @@ jobs:
         conda install pytest
         conda install pytest-subtests
         conda install pytest-cov
-        conda install simpeg
+        conda install conda-forge::simpeg
         pip install git+https://github.com/kujaku11/mt_metadata.git@main
         pip install git+https://github.com/kujaku11/mth5.git@master
         pip install git+https://github.com/MTgeophysics/mtpy_data.git@main