python version update also in master.yml file

.github/workflows/master.yml

@@ -10,10 +10,10 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v2
-      - name: Set up Python 3.8
+      - name: Set up Python 3.9
         uses: actions/setup-python@v2
         with:
-          python-version: "3.8"
+          python-version: "3.9"
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip