chore(ci): update Python version to 3.9 in CI pipeline

Updated the Python version from 3.8 to 3.9 in the CI/CD pipeline
configuration file. This change ensures compatibility with the latest
features and improvements in Python 3.9.

.github/workflows/ci_cd_pipeline.yml

@@ -14,10 +14,10 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
-      - name: Set up Python 3.8
+      - name: Set up Python 3.9
         uses: actions/setup-python@v5
         with:
-          python-version: "3.8"
+          python-version: "3.9"
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip