reverting push_tests changes for debugging unit tests errors

.github/workflows/push_tests.yml

@@ -17,10 +17,10 @@ jobs:
       - uses: actions/checkout@v2
       - run: |
           git fetch --depth=1 origin +${{github.base_ref}}
-      - name: Set up Python 3.9
+      - name: Set up Python 3.7
         uses: actions/setup-python@v4
         with:
-          python-version: 3.9
+          python-version: 3.7
       - name: Node cache
         uses: actions/cache@v1
         with:
@@ -46,10 +46,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - name: Set up Python 3.9 (pyenv)  # pyenv needed for mlflow in cli annotate tests
+      - name: Set up Python 3.7 (pyenv)  # pyenv needed for mlflow in cli annotate tests
         uses: gabrielfalcao/pyenv-action@v9
         with:
-          default: 3.9
+          default: 3.7
           command: pip install -U pip  # upgrade pip after installing python
       - run: pip install virtualenv  # virtualenv needed for mlflow in cli annotate tests
       - name: Python cache
@@ -79,10 +79,10 @@ jobs:
     timeout-minutes: 20
     steps:
       - uses: actions/checkout@v2
-      - name: Set up Python 3.9
+      - name: Set up Python 3.7
         uses: actions/setup-python@v4
         with:
-          python-version: 3.9
+          python-version: 3.7
       - name: Python cache
         uses: actions/cache@v1
         with: