update run_unit_test.yml / fix pip version

.github/workflows/run_unit_tests.yml

@@ -25,7 +25,7 @@ jobs:
 
       - name: Install dependencies
         run: |
-          python -m pip install --upgrade pip
+          python -m pip install pip==23.1.2
           pip install -r requirements.txt
      
       - name: Lint with flake8