Try forcing macos runner to 13 instead of latest

see: 

conda-incubator/setup-miniconda#344
and

https://github.com/conda/constructor/pull/777/files

.github/workflows/run_tests.yaml

@@ -47,7 +47,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ "ubuntu-latest", "macos-latest", "windows-latest" ]
+        os: [ "ubuntu-latest", "macos-13", "windows-latest" ]
         python-version: [ "3.8" ]
 
     # Main steps for the test to be reproduced across OS x Python
@@ -64,10 +64,12 @@ jobs:
 
       # Step 2: Install environment.
       - name: Install Conda Env All OS
-        run: |
-          conda update
-          conda install environment.yml
-          conda activate ads_env
+        uses: conda-incubator/setup-miniconda@v2
+        with:
+          python-version: ${{matrix.python-version}}
+          activate-environment: ads_venv
+          auto-update-conda: true
+          environment-file: environment.yml
 
       # Step 3: List conda info, conda packages
       - name: Conda info and list