Update Python version and requirements path in workflow

.github/workflows/django.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       max-parallel: 4
       matrix:
-        python-version: [3.9, 3.10, 3.11]
+        python-version: [3.11]
 
     steps:
     - uses: actions/checkout@v4
@@ -24,7 +24,7 @@ jobs:
     - name: Install Dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install -r requirements.txt
+        pip install -r ./src/backend/requirements.txt
     - name: Run Tests
       run: |
         python manage.py test