Update python-app.yml

Author: priyagupta108

.github/workflows/python-app.yml

@@ -27,7 +27,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v5
       with:
-        python-version: 3.9
+        python-version: "3.9"
 
     - name: Check Python version
       run: python --version