Update Gitea workflow to install Python dependencies dynamically

.gitea/workflows/update.yaml

@@ -10,12 +10,13 @@ jobs:
     runs-on: ubuntu-latest
     container:
       image: python:3.9-slim  
-    steps:
+steps:
       - name: Checkout Code
         uses: actions/checkout@v4
 
-      - name: Install dependencies
-        run: pip install requests  
       
       - name: Update README file
-        run: python update_profile.py
+        run: |
+          # Check if python3 is there, if not, install it quickly
+          which python3 || (sudo apt-get update && sudo apt-get install -y python3)
+          python3 update_profile.py